I've been playing the demo some and it's definately a major improvement over TS3. The only issues I have had so far are how easy it is (I played as Nadal against Federer last night, on hard and won 7-0), the player animations seem even worse, and volleys still seem very difficult, although they are much easier than TS3. I'll definately pick this game up on release, how can I go wrong with a game that comes out on my birthday
I've also played ITST before, and will probably play some tournaments in TS4. The guys who play it are really good though, they beat me pretty badly, not that that's saying much lol, but they are all very nice guys. I'd definately be interested in a TT league, would we use customs players or pros?