The stats for the existing LOTR range can be found in the five current sourcebooks, they contain everything you'll need for profiles and armybuilding.
As for mixing and matching troops, I wouldn't expect there to be any problem. We'll find out for sure within the next few days, but GW have said that LOTR and the Hobbit will be fully compatible.
And finally, I feel the same way about the lack of good guys. Trouble is like FOTR before it, with it being an 'introductory' film most of the armies will appear later on. We champions of good have plenty to look forward to; Wood Elves, the men of Lake Town, Beorn, possibly a new range of eagles, etc etc. We just have to wait for them