Along with the 8 main characters, they show 3 boss characters, and 4 males that already have background significance, but could also become playable at some point.
The project seems ripe with ideas all about it, though I wonder if they're viewing DLC more as a constant stream, or maybe just groups and packs as time goes on. There's view of quite a few random stages throughout all these preview vids, in various stages of sketchwork and full completion...
And I rather like the Alt colors so far too.
Oh, and here's a Preview vid from 8/9/10 detailing the game mechanics + basic tag system:
http://www.youtube.com/watch?v=Q0KV4ZLwkAk&NR=1