The video above shows the new 500mm f/4 lens on a NEX camera! You have to go to minute 13:00 to see it. A little bit before (minute 11:35) you can see the new A77 prototype.
One more news: A dealer from Austria reported that Sony told him the [shoplink 3028]Sony A850[/shoplink] will be discontinued. We already heard similar rumors during the past months but I have no more info from my sources. Source: Sonyuserforum.de