When Capcom brought Tatsunoko vs. Capcom: Ultimate All-Stars to the states back in 2008, it was a huge surprise. Mainly because it was assumed that the game wouldn’t make the trip due to the huge amount of licensing needed for all the Tatsunoko characters. Now, that huge licensing rights agreement that Capcom made with Tatsunoko has now expired. Meaning that Capcom can no longer sell Tatsunoko vs. Capcom: Ultimate All-Stars in stores anymore.
Our rights with Tatsunoko have lapsed fairly recently (so we’re no longer allowed to sell the title physically or digitally). Unless Japan were to strike a new deal, I’d say the chances of this happening are slim.
So if you still have plans of purchasing this game, your chances are slowly slipping. Stores can still sell whatever copies they have left, but they won’t be receiving any further stock after that.