Kul Teska is a Toys "R" Us exclusive figure which, surprisingly, just showed up. We found a sample at Toys "R" Us in Phoenix, AZ for $14.99 and snapped some quick and ugly photos.
The figure is simply massive-- he towers a couple of inches above Darth Vader and seems bigger than most deluxe-sized Transformers figures. He has a gun arm, but includes no removable accessories or firing rockets. His shoulder pads open up to reveal weapons, but they aren't much to speak of. He's probably at a store near you, so happy hunting!