I thought Sony announced a little while back that they're putting their main thrust behind their APS-C lineup (which most people see it as a retreat from the FF market).
If I remember correctly, they discontinued their Alpha-850 w/o replacement, leaving the Alpha-900 as the only available FF model (which predates the 850).
Yes, they removed the A850. I always thought that their A850 A900 strategy with just slight spec/price difference between them was a poor one. From rumors, they are going to hammer on the FF market. It seems they are going to release a low res and high res FF cameras, where the low res means about 24mp, and the high res might be around the 40mp. This seems similar of what is expected from Canon.
It is interesting to monitor their A77 with 24mp, APS-C, very high ISO, 10fps, significant improvements on the weak points of the SLT technology, and priced slightly more than the 60D. If this rumor is correct (and seems it is a very reliable rumor) I am curious of the new generation FF cameras capabilities.