Valve tested the Dota 2 experience on current-gen tablets and came away with a bad taste in its mouth, studio founder Gabe Newell told Kotaku. Today's tablets just weren't fast enough, apparently:
"We were working on getting Dota 2 running on some tablets," Newell 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."
However, Newell also said that he is quite optimistic about the new talblet platform, and he believes new tablets that can hold Dota 2 should become true in near future. We hope that will go faster!