Really excited (but wary since Rocksteady isn't in it this time) for Origins. Multiplayer sounds interesting.
The guys over at VideoGamer have actually played the multiplayer mode so you can listen to what they think about it here:
http://youtu.be/_MD2ETetF2U?t=55sMultiplayer can be coop, right?
Multiplayer is 3v3v2 only sadly, but I guess in the fact that you're in teams it's sort of cooperative but not a coop campaign like what tails said (which would be awesome).
I would rather have coop campaign rather then a multiplayer mode that's been done before and nobody will play after a while and will take resources away from the singleplayer.
It's actually a pretty interesting concept having three teams in 3v3v2. Also no resources are getting taken away from SP as they are outsourcing another company to do multiplayer I believe. :D