There is a decent bit on the official site
if you want to poke around on it. I will agree that it seems like there's some actual effort being put into the game as far as a mobile game is concerned, but that alongside the fact that its multiplayer almost guarantees it won't come to the West. The Mobile market for games is very different in Japan.
Some random things I can say:
-The premise is a pretty obvious setup for the type of game it is (You're fighting an evil empire). While the site claims the game will have story missions it'll probably be dripfed- a lot like an MMO basically.
-The main character is created (so again, like an MMO), so there's no actual blue-haired Ryu-equivalent in this game
-I actually think the art itself for the game is quite nice (still prefer the other 5 games though), but I hate the types of sprites they went with. Don't understand the obsession mobile games have with that style.
-Your main character can change classes as he grows
-The site advises you to synergize your skills with the people you party with, but obviously you can't really tell if that's just a flavor thing you can choose to ignore or something you'll have to do to win
In addition to the above: http://www.siliconera.com/2015/03/20/breath-fire-6-shows-off-multiplayer-missions-class-changing-costumes/
The MC also has Dragon Transformations (which makes it slightly more of an BoF game than MMX:Command Mission). Also, points I guess for the series coming its closest to having a protagonist named Ryuuko instead of Ryu (not that we're getting either, mind ryu).
I guess we can all agree that at least its probably going to be better than XOver.