I got to play Bit.Trip FLUX in its entirety yesterday. I loved it so much, but I promised the guys at Gaijin Games I wouldn't tell you that (or anything else about the game for that matter) without their explicit permission.
Luckily for me, reader NintenDaan scored these pics of the game from completing the Bit.Trip level in Mission to Snowdriftland, which allows me to post them for your delight. Sadly, I'm not sure if I can tell you anything else about the game; not until I hear from someone at Gaijin.
I'll be sure to update this post if and when I hear from them. Sorry to be a tease, Bit.Trip fans! As for you non-Bit.Trip fans, go download the Bit.Trip FATE demo. You'll become a fan sooner than you probably think. Same with Lilt Line (which also has a demo out). To play these games is to love them.