The good news is Marvelous set a date for Kateikyoushi Hitman Reborn! Dream Hyper Battle! and it is January 10, 2008. The bad news is it’s just a port of the Playstation 2 fighting game of the same name. Marvelous
Edit: Ttora points out there are new characters like Squalo on the left and it doesn't look like Belphegor was in the original game either.