None of the other studios announced titles yet (and were reportedly surprised that WB went public so soon) but most of the major 4th quarter releases are expected to become available.
Ultraviolet will allow customers to buy a digital copy of a film and then access it from any device that has updateable software. So, for example, you can start watching GREEN LANTERN on your TV, watch the rest on your iPad and then watch the rest on your laptop before realizing the movie is crap and you’re probably never going to finish watching it.