Yeah, Toshiba and Canon are apparently set to start production in June/July of 2007. So they might be available in fall, but you will pay the early adopters tax to get them then.
From what I understand, not much is changing on the new SXRDs although they will be a little less deep, although at around 18.5" they aren't exactly deep as it is.
I just wish they would offer the side speakers as an option. Apparently a lot of customers are complaining about them and the people who can afford custom installs are just having the cabinet faces built in front of them so you just see the screen.