Ya, I doubt it also. At the least, I would expect some kind of mecha toy that modders could make use of fully. At least some kind of toy that could articulate, or be simulated in a game fashion, or something. It would open up two-three doors for modding in the US zone (Transformers & Star Wars) + Japanese side (Gundam & Macross). I'd even add in Busou SHinki in the Japanese mark that I wanted in Minecraft, yet have to now move over to Rising World for it being suited better for that idea.
KanColle would literally be ships turned into girls with ship parts attached onto them. It's quite neat on the web game with how you collect cards. Google search + digging deeper when you want to learn more about their history after hearing their pre-recorded lines in the game. Even stumbling across others that were in the war & such. It's thanks to this game that I was able to learn more about WW2 history, about the Canadian navy, hidden & forgotten units, among others. As odd as it may seem, it does make you curious to learn more. I'm also trying to poke an 'RCN KanColle' mod into the mix once Red51 adds in biomes + Water + Customization & most importantly 'NPC Traders', or NPC followers. I'd prefer NPC followers themselves. I'd also happily welcome WW2 vessels on their own. [RCN KanColle thread]
I also doubt nudity would be part of the official, more so because Red51 said he won't officially support it because of ratings & such. He wants to keep Rising World mature, if family friendly. All for kids & adults at same time. This is why I'm expecting it to be more of a mod thing, if Red51 makes the character models be overly visually appealing. If not, then I'd probably expect Skyrim mods to be carried over into this game once it gains a 'louder' & 'bigger' following hmm. Keep in mind that I don't want one for the sake of it, just that I prefer keeping things 'classy' while keeping away from anything 'rapey'. I only want 'immersion' type mods. I walk away from futa type mods & anything brutal.
Character's (colour; whole palette) skin, clothing customization/options, skinning dead animals, + both genders is a big thing for Rising World. I'm also a furry, yet in a more 'classy' manner [preferring Ahri type characters]. Has to be good quality for me to respect them. I'll make myself be male & such, yet would love to instead customize the NPCs to have one be my foxy arctic fox mascot being all white with blue eyes. I want to finally be a male in a game I play with character options to match. With Rising World & with Red51 being open-minded I'm hoping I can nudge Red51 into the right direction of being open to everything, including customization options for both genders & NPCs being your comrades + customizable. There's of course lots to do, yet I can be happily patient waiting for them to be added in. Mods shall bring everything else with it. Red51 should still however take a very strong peak & look at 'Phantasy Star Online 2, Xenoblade Chronicles X, & Illusion games I mentioned for the proper character customization (even if i did curse at Xenoblade's limited character creation option). He'd benefit greatly for taking their detailed character creation route that people shall jump into Rising World purely for character creation to then build around their characters. 
We'll eventually get a lovely night sky & such. Silent Hunter 3 had real constellations that others spotted & I somehow missed. I'm sure Rising World shall reach & surpass this line nicely. I truly hope that Rising World also reaches the bar set by Wurm: Unlimited with how the fog roles in, or how in Euro Truck Simulator 2 it rains & thunders realistically. It should be sweet when we reach that point in the game stage.
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Back to modding though, I strongly hope I can happily add in KanColle units (fan-made) + Busou SHinki stuff. The game is awesome on its own while also having the potential to host both Busou Shinki & KanCOlle mods. It's highly unlikely I'll see them, yet be awesome if I and others could get them in. Star Wars, Gundam & the rest I'll leave to the more experienced modders while hoping I can make use of the NPC Traders & NPC options of their own. I need the community & Red51's help to make the two mods I seek possible.
Forgotten thoughts behind spoiler:
I forgot to mention that I also wanted to also keep the 'Busou Shinki' thought alive. I know I can't do it alone & I'll probably never see it in this game, yet hoping there's a curious Japanese modder to add it in for me. They're basically robotic 15 cm tall fully aware battle robots designed for battle, yet can also tend to other tasks. They can also fly or swim, depending on what they're themed after.
https://en.wikipedia.org/wiki/Busou_Shinki
Konami killed this line that i wanted to keep them alive in Minecraft, yet nobody wanted to help me. Seeing Rising World has me seeing greater potential that I would much rather have it in Rising World over any other game, more so for it being dual-aged for Medieval & Modern. We'll be getting highly detailed stuff + it's overly detailed as is that it would fit Rising World. I'd love to see my lovely 'Shinki Renge' (My avatar) in the game being her silly self, even assisting in light combat or helping with overly basic chores. For the types that can fly & swim could help you gather or scout for you in either air or the ground.
You can basically keep them in two mods, or three: 1) Combat oriented - 2) non-combat - 3) Both - with them being able to do as you & their AI desires. They may be tiny & possibly also hard to see, yet they'd be neat for when you do find them. Even having a jestful gimmick of having them sit on your shoulder, or to carry them in your hand in place of another item would be comical.
For those that do love battles though could battle in the open, or make battle pads to mimic the terrain around them. Virtual reality or pre-built terrain for them to battle on. Lots a modder can do, more so with the Japanese modders.
There's just so much I can think of for modding in Rising World that i'm driving myself crazy. More so when you also make note of the vanilla stuff that would nudge the modding, and the added frustration of being unable to mod such into the game. I hate not being able to draw or mod whatever I want. I always have to rely on others, even when I did try to draw & mod. 
(Edit; I do keep bringing up Red51 with that only being I'm relying on both Red51 to add in the main features for modders to then build off of that. Relying on both equally.)