Announced earlier today at the Japanese gaming conference, BitSummit
http://www.youtube.com/watch?v=9Wm8-DsVqHE
Seems to be very much like Megaman Zero, which makes some sense given the developer's history.
One of the best part about this announcement is that it already has confirmation of localization
Screenshots: http://www.4gamer.net/games/249/G024999/20140306072/
Official Twitter: https://twitter.com/GunvoltOfficial
Official Site: http://www.gunvolt.com/
3DS Friend Code: 047387541842