Rising world make constant and steady progress, but at a moderate rate because the dev team is very small. Most of your points have already been raised by others peoples:
- Water things (fountains, piping sytem) are a much anticipated but problematic feature. Liquid physics in video games can lead to plenty of very bad issues
However, Red has clearly stated on several occasions that it is planned (but probably not for soon). More realistically, we can perhaps hope for more conventional solutions without waiting years, such as fake water jets, waterfalls, static water blocks...
- Plants flowers & bushes. Its clearly on the list and very much expected too.
- Movable construction (spin and maybe more ...). Its a big improvment that could be on the long term list. It would significantly improve the game, but we will have to wait, as it's probably almost as complex to implement as liquid physics.
- Blueprints enhancement. First thing is that blueprints must have a resource cost. This point seems to be on the short-term list (few months???). Secondly, blueprints must be tradable between players directly in-game. This isn't currently the case. Finally, it will likely be up to the servers to implement their own trading systems, which already exist on some of them.