I got a tip about two new full frame Sony DSLRs coming out this August: one will be pro, above the current a900 model and another one that is suppose to be very cheap, under $1000. Full frame for under $1000? I don't know... I am expecting more info on this rumor.
On the same topic, few weeks ago somebody on dpreview listed Sony's DSLR future release schedule (note that this is also an unconfirmed rumor):
The last leak on Sony's website was the Sony a500 and a550 DSLR cameras and I think we will definitely see those very soon.