The next Bit.Trip game has a name and we know a few other bits of info.
http://www.nintendoworldreport.com/news/23880
Tucked away in Nintendo's recent release date press release was the official name for Gaijin Games' next Bit.Trip game, which is Bit.Trip Fate.
The development team recently teased the name of the title on their Facebook page, revealing that it was Bit.Trip F_ _ _.
Gaijin's Alex Neuse also gave another hint on their Facebook page: "I just got my first legitimate PERFECT in an entire BIT.TRIP level! It was Level 1 of BIT.TRIP F_ _ _! My key to success? The Wii Zapper."
This also follows earlier discussion that labeled the fifth Bit.Trip title as "the Empire Strikes Back of the series." Bit.Trip Fate is the second-to-last game in the series, with only one more game planned after it.