Now it's official:
http://www.legitreviews.com/news/13138/
http://forums.anandtech.com/showthread.php?t=2246084
There are 2 Tesla models - the K10 with 2x GK104 (available soon) and the K20 with 1x GK110 (available Q4 2012).
The interesting thing is, that Nvidia uses the "gaming chip" GK104 also for the Teslas and is claiming 3x SP performance compared to Fermi. This would mean, that the hardware of GK104 is capable of high performance GPU computing, but probably software developers have to optimize code for CUDA 5.0 to make use of it and unleash the power of the new chip.
Concerning GK110 Nvidia is talking only about the DP performance which is expected to be 3x of Fermi. But the SP performance seems to be comparable to 2x GK104.
So, the good news is, because SP performance is the important thing for us Octane users, the only thing we might have to wait for is a CUDA 5.x optimized Octane, but there is no need to wait for GK110 which will not be available before Q4 2012.
Using Octane 1.11 on Intel Core i7 3770K @ 4,4 GHz / 16GB RAM / EVGA GTX670 SC+ 4GB driver 306.97 / Win7 x64 SP1