It's starting to get a little more serious now that LA has approved to start building the new stadium. The Raiders and Chargers seem like the 2 finalists.
I think it'll wind up being the Raiders if it's going to be one team. Oakland isn't willing to do anything for the Raiders, Warriors, or Athletics as far as new buildings so all plan on leaving Oakland in the future.
The Chargers need a stadium, but I remember reading that they're looking to get something in place.