Update: B&H is now shipping the Tamron 15-30mm f/2.8 lens.
The first Tamron SP 15-30mm f/2.8 DI VC USD full frame lens ($1,199) video reviews are already out:
Sample videos taken with the Tamron SP 15-30mm f/2.8 DI VC USD lens:
The Tamron SP 15-30mm f/2.8 DI VC USD lens is available in Nikon, Canon and Sony mounts.
Additional information on the new Tamron lens can be found here.
Sample photos can be found on Tamron's website.