Well, this time not with ourself but with Zap2it.com.
In this article, David talks some about the current timeslot of Futurama and then some about Season 4.
"Our time slot doesn't even exist on FOX throughout most of the fall. It's frustrating -- it's very frustrating"
Additionally, Zap2it.com has the Season 4 trailer both in ASF and RM
Thanks to Frank on the german FFU board for the hint