Is it just a faithful retelling of the movies with one guy doing all the sounds and voices.

Or does he intersperse commentary throughout?

I haven't seen it so I can't answer your question but I've heard it's good.

I saw it at C3 in Indianapolis, and it is a faithful retellling. However, he does occasionally insert a one liner or quip once in a while. I'm a big Star Wars fan and found it to be a great show.

Is he going to be doing any of the prequels?

I went opening night in NYC (last Tuesday) and it was awesome.

You can find video excerpts here, to get a feeling what it's about.

That's pretty funny actually

He's thought about doing the prequells but hasn't started working on them yet. I read that in Time Out NY. I can't provide a link - so I just hope you'll believe me