I think it's likely they're already working on Fallout 4, after all they've had a second game confirmed to be in pre-production for a while now, and Obsidian devs mentioned a few times during development of New Vegas that Bethesda stopped them from doing a few minor things that they wanted to do themselves. But considering Skyrim isn't even out yet we likely have a few years left before we hear anything about it.
Me too.
Hopefully not. I'm hoping they'll acquire the rights to something else.
I hope they never again buy the rights to an old series, and instead develop new IPs if they want to make something different. I'd enjoy playing a new Bethesda franchise without having to put up with a pre-existing fanbase like what happened with Fallout, which came with a fanbase that's to this day incredibly hostile to Fallout 3/ Bethesda fans.