Most probably it has been said, but modders could really work now with 3D modelling when it comes not only with their faces but with their bodies, right? I'm not talking about animations here, of course. I really like the graphics of this game, and I imagine some tennis players with these graphics and I think this could be really, really good.
Also, how bigger do you plan to make the player editor? Given that we can't have "scenes" (I'm thinking here things like entrance and so on, PES/FIFA style), I don't know if it would be possible to have a strong player editor.