I personally think the 520 will still be a straight Sandforce design, but you may see the Anobit controller used in the 530 due late 2012.
Sandforce controller with Anobit firmware?
Not a chance in hell of that happening. In order for that to happen SandForce would have had to supply Anobit with top secret engineering information on the inner workings of the SandForce controller, and firmware source code. That would be suicide for SandForce.
From the picture in the link. The firmware version is 31Hi, not 31H. But this means nothing, as the firmware version number is only a "string", and SandForce partners can choose their own if they wish.
31Hi could simply mean something along the lines of. Version 3.1 High IOPS.