Go to Sony Style US website and attempt to register a new product (you need to be a registered user) - type DLSR and a drop down menu will appear:
The three new cameras listed are: Sony a500, Sony a550 and Sony a850. A similar leak came from Sony Style Canada few months ago, but the a850 was not listed. You can currently register any of those three products, but no further details are available.
The rumor is that this new set of Sony DSLR cameras will have video recording capabilities. Sony a850 could be full frame.