I hope so.
Sliding on clay would be incredible. I haven't seen any tennis game ever come close, and it wouldn't surprise me if TE did it first.
What I'm more concerned, for lack of a better term, about is whether we'll see sliding on grass and hard courts, ala Novak. It should only be something that one or two players in the database can do, so maybe a talent, but we have Djoko's playstyle in the game. All we need now is a replica of his movement and agility.