yeah, one of the worst remixes IMO has to be patchoulis theme. No matter how much you try, you can't remix that song without destroying it.
anyway, I think touhou 13 will continue the chain of events that started in 10. Maybe Byakuren will be one of the playable characters? Maybe, but it's safe to say that it will DEFINATELY involve reimu and youkai. :V
Patchy is one of my fave chars so I always want to find a good remix for her. Admittably there are few but I these two are a good start if you like none:
http://www.youtube.com/watch?v=D0j8nNILSUQ (metalish)
I don't like electronic music typically, bu tI think sensative heart's version is quite good as well if you like that kind:
http://www.youtube.com/watch?v=wLD3-638lMkThe remix in the fangame Mystical chain is perhaps the best of all. Unfortunately it's too s hort unless you repeat it game-style, at which point the uber intro gets lost after the first play >=(
http://www.youtube.com/watch?v=S9zCFVYQXzs&feature=PlayList&p=9FA0CC820048E37A&playnext=1&index=10I don't really have any speculation about Touhou 13. Half of me hopes it's not a phantasm game, half of me does. I mean I disliked them in Touhou so far, but I keep hearing something about a versus shmup game (I forget the name, something sweets or fairies I think) that is quite good, so part of me wants a good one if Zun can pull it off.
If there is a phantasm game, I hope to god the remixes in the game are better than the last phantasm game (I dislike almost all of them compared to the original).
I think Hatate being in it is a safe bet though.