Okay, talked to some taiko guys in #taiko.
*HR + HD should be like one update before, 0,3s more visible time as Tasha said.
-> Problem here is, that many scores would be overwritten.
HR should have a bit more visible time as well because the scrollspeed is a bit too fast.
*HD is right now unplayable. We thought about to set it how it was before for now.
-> Problem would be that people with no wide screen couldn't play it anymore.
aabc271 said most points worked at version osu! b20120904
*Right now I'm not sure, probably HD and HD+HR would become somehow the same difficulty.
Well, these are for now informations about the current situation. Tasha is going to write a concept for it.
Edit: Aha. As some people said before, HD works on 4:3 perfectly.
Edit2: Played the screwed Hidden mode in multiplayer. It is kind of really fun! Maybe we could at this a new Blink-mod? Activating it in the same way Nightcore. lol