That would be amazing. Calm Mnd, Surf, Aura Sphere, Ice Beam/ HP/ Filler move...I would die happy.
That would be neat indeed, and Aura Sphere and Ice Beam access would be enough to give it some real incentives over Keldeo. However, since it looks like Froakie will have at least a decent Speed stat, I feel that GameFreak could also make it a physical Water/Fighting with actual Speed and Attack with access to Close Combat, making it sort of like a Poliwrath for OU.
As much as I love Poliwrath, I admit that I'd like to see how far a physical Water/Fighting combo can go.