Yes, obviously there's going to be a third game. It's a long way off, still. But what are they going to do with it? Match-3 puzzler? We should be so lucky. Instead it's going to feature an art style similar to DA2, and you'll be able to full tinker with the loadouts of your party members. Fighting will also be encounter-based, rather than surviving waves of enemies. Hooray!
You see, using my sneaky internet-enabled "eyes" to read this comprehensive thread on NeoGaf, I am able reveal that the game is about "Saving the world from... itself" (you have to include a little pause there when speaking aloud, with dramatic turn to camera) and that whether you play as a set character as in Dragon Age II, or as a player-created character, has yet to be decided and will based on player feedback. Hmm, I think I'll use my magical ear-trumpet to collect that feedback for you from the howling winds of the internet, Bioware: player-created character. Lots more detail in the thread. There might even be co-op! Maybe. A yes please there, too.