The last ReimuBros video is old, and I've not revealed much about version 2.0.0 so I've compiled a few clips of some of the new stuff.
The update is going well, so it should be out any day now(hopefully).
What to expect:
more character abilities.
customizable avatars. (multiplayer compatible)
more gameplay mechanics.
a new game mode.
some new music.(also I've tweaked the soundtrack...yet again XD)
You can play the current released(1.6.1) version online here.
Or download it from indiedb.