Well I have finally seen WipEout HD in 3D, a small glimpse of it at least, at a Sony store. It was in video though so of course they "bullshoted" it and made the video 1080p... But it was still really impressive!
There was the game on the console too, but they would not let you play. So I cannot judge on what it actually looks like in-game engine.
I'll see if I can play in another store maybe. I would really like that.
All I can say is Sony's 3D works really well, but a big TV is preferred I think as it will be this much more immersive.