The new FF game that's been announced is quite likely a Dissidia spin off due to featuring Cosmos and Chaos on the logo and having Lightning, Onion Knight, WoL and Cloud confirmed as appearing. Also the style is the KH chibis design, similar to those player icons you can purchase from the PP catalog. Here's the comm post.

Well despite being a fan or Leon, Zack, Genesis, Vayne and Seymour I'd need to know a bit more about what they'd be doing there specifically in order to get excited. (For some reason I'm really having difficulty coming up with ideas for characters I'd want to see in Dissidia)