I couldn't find the longer preview clip; apparently they have it on Hulu.com, but those bastards discriminate against Canadians. *grumble*
Anyway, here's the standard preview (it won't air until next week though; maybe I'll find the longer clip by then):
Hee hee, it looks awesome. Apparently there are plans in the works for some webisodes to bridge the two halves of season 4, and also 3 new TV movies to be produced after the series ends! And of course, Caprica debuts this fall. How great is that?