New side-scrolling action game for the 3DS being developed by Keiji Inafune and Inti Creates, the studio behind the Mega Man Zero and ZX games. Looks real cool. Those ZX games weren't very good so I can't get too excited about it, but I do hope it turns out well. So far I've found the 3DS library to be nothing but disappointing, and it'd be nice to finally play something great on the system.
Famitsu has loads of screenshots and artwork: http://www.famitsu.com/news/201403/07049429.html