That's not a roadmap :D, it's the features that will be implemented someday.
That's as close to a road-map as you're going to get. Red51 said that updates shall be done "when they are done". You'll get things when they're considered complete.
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Also @ OP:
I wouldn't mind building things in chunk to then piece together. Building a bed frame, a bed, and such out in the open would be awesome. A bit too complicated when you add in the tiny bits, yet be sweet to have some form of complexity added for various variety in this game. Having played Minecraft + Feed The Beast with Mindcrack & any technological modpack would make me feel at home.
Also, biomes first, THEN water. Let's not complicate things for Red51 because I want biomes to finally be released.....We'll also get static water before physics because of how complicated it is.
I do hope Red51 makes note of crushing stone into sand because that's what was done in one Minecraft mod, and it does wonders in this sort of game.