One of the primary focuses of Valve over the past few years (at least, that people know about) is Dota 2, an ARTS title the company has had in beta for a while. Interestingly, Valve CEO Gabe Newell reveals that he wants to bring the game to tablets, but they can't handle Dota 2 just yet.
"We were working on getting Dota 2 running on some tablets," he said. "That ended up being kind of a disappointment. But the good news is that tablets are getting faster very quickly, so I think we'll get the kind of performance we want and other game developers want in the near future."