If it's true, it's kind of awesome. To be honest, I didn't even know that Christopher Lee didn't do his own fighting in the Star Wars prequels. I just thought he was a particularly limber and robust old dude who didn't mind getting hooked up to a harness to do all those flips. Which means I am either Borat-level gullible to the masters of visual effects, or those effects are really effing good. Personally, I'm going with the latter, as I don't like to think of myself as gullible, and I'm also usually pretty good at picking out what's real and what's an effect. The only real problem I see with this rumor proving true is that I know about it. That kind of cameo is usually the most fun when you're not expecting it. That said, I've long thought that a Terminator isn't a Terminator without Schwarzenegger, so hooray for legitimacy through visual effects!