I think it's very possible that the next PC is still going to be the Inquisitor, because:
- In the end, everybody gets a pretty similar outcome. Inquisitor is alive, missing a arm, chasing after Solas (with or without the firm intent to kill him). That could explain why they didn't make it possible to follow Solas or get killed by him.
-They say you need to get new people, some that Solas won't know about, and they're going to get reinforcement from Tevinter. This is a reason to get a new crew, and explain why most of the Inquisitor companions won't come back. I'm thinking Mass Effect 2 here, where they had Shepard disappear for 2 years, just to give her a new crew.
-That could be why it's called Dragon Age: Inquisition instead of Dragon Age 3. Because they wanted to make a trilogy, i'm thinking MAss Effect again, with the amazing popularity of Shepard. So we might have Dragon Age Inquisiton 1, 2, 3.
English not being my first language, I hope it makes sense 