Just had an email from GW saying that they're going to be releasing a second wave of Space Wolf models soon. Sadly no pictures yet but I expect a plastic dreadnought kit (to make Bjorn etc), some thunderwolves (finally!) and fenrisian wolves. Bit frustrating when a lot of people, including me, have gone and bought third party ones. Mind you I can guarantee the GW versions won't be cheap based on the recent pricing for the GK stuff.
I'll keep you posted when I have more details and hopefully some pictures.