I heard about the spinoff on SciFi's Lexx message board. It was supposed to star Stan and Xev, and I presume 790 would show up at some point. I'm hoping they'll still go through with it. It definitely *would* be cool...
I've been lurking here for ages, but this is just the first time I've spoke up. Nice to meet you, too.
Here is the official page:
http://www.scifi.com/lexx/