Rivals 2 by Aether Studios

The predecessor is generally considered the best non-Smash platform fighter and the sequel has been highly regarded by Smash fans/pros that have played the pre-alpha build. The Kickstarter hit 1 million. Will have ranked mode and a seemingly a Brawl subspace emissary-esque story mode after launch as well.
Trailer:

Early access testing build gameplay videos:

Forgot to update this thread as more news comes out but this game has only gotten incredibly positive feedback, the first beta weekend just happened this previous weekend. I'll post content / tweets I saw recently