Playstation.Blog has posted some Virtua Tennis 4 information. How cool is the following quote?
"When the ball is coming towards you, it glides seamlessly into a first person viewpoint where you can see your racquet in front of you and time your swing accordingly. You can even twist the racquet to adjust its face when it connects with the ball, allowing skilled players to apply spin. It’s accessible and extremely intuitive, especially when playing in stereoscopic 3D."