At least as of this writing (1:45p PT) NBC confirms there will be a new Tonight Show tonight and that Conan will be hosting.
Among the guests, Chuck's Zach Levi. Between all the Conan news and all the Chuck news lately, that's about as close as it gets to Jupiter aligning with Mars for me as far as late night TV goes. I'll be watching!
Tom Brokaw and Roseanne Cash are also scheduled to appear.