My guess would be, test patch in spring of 2011 (april or may) and 2 months of public testing.
Considering Scawen hasn't reported anything about carcass development, I take that as it itsn't finished yet. After 20th of December, I expect Scawen to stop working and be with his family 'till new year. And if carcass isn't finished, it means the VW stability control, suspension updates and limited setup system aren't finished either and knowing the development history I'd say they'll require quite a time.
Unless Scawen silently finished most of that and is preparing a test patch for us to test in christmas while he is relaxing.