Castlevania: Portrait of Ruin trailer and screens...

[Mentok]

http://ds.ign.com/articles/727/727743p1.html

New screens and footage

 

[Zenien]

That looks pretty good, but how exactly does the dual character system work? In some clips they're both together (2 player?!?) and in others it's like MegaMan X8 switch out on the fly.