Thanks for the reply - that is good to know. I'm interested in the Tamron's also, there are a few folks on Flickr that seem to be using them on the F5/F100. But when I asked Tamron specifically they said "no" it wouldn't even auto focus.
So Tamron is saying the newest SP lenses will work (i.e. auto focus and VC) on the F6 only. I am still curious if this is true or not, I have seen people using them on Flickr on both the F5 and F100. But they may be using manual focus only.