I just returned from the Pro Photo Expo here in southern California [Pasadena Convention Center]. Lots of vendors like Canon, Tamron, Sigma, Leica, Mamiya, Lowepro, printing companies, lighting, software, etc. Link is here http://www.prophotoca.com/expo/index.html![]()
I was speaking with a Tamron rep and he said Tamron will announce its first-ever image stabilized lens at PMA, and it will be called Vibration Compensation. So Canon has its IS, Sigma has OS, and now Tamron will have VC. He could not tell me the exact model, but it is a remake of a current one and one of their most popular lenses. My best guess is something like the 28-75 or 200-500, but that is only a guess. He said it is their "Di" line, which means it is good for FF or APS-C.
Also, they are remaking their 70-200 lens into a constant f2.8. He also said no plans are in the making for any type of ring USM/HSM units though.
I'll see if I can post a few quick snaps from today's events later in this thread. Lastly, I tried to handhold the SigMonster...what a joke! 
Here are some of the snaps http://www.pbase.com/lightrules/photoexpo_feb07![]()

I know they do make a 70-300....that in a 2.8 would be wicked. 

