Intel did some preliminary testing and found that desktop boards series 6 and series 7 ones support these 3 processors (E3-1225, E3-1260L and E3-1220L). I know for sure that on Intel Server Board S1200KP which is a C206 Chipset Board you need a new board revision (S1200KPR) in order to Support E3-12xx V2 processors) which lead me to the conclusion that Intel will not releasing any new Bios Update to support new E3 Xeon's on Intel Desktop Boards 7 Series.
This is my opinion but don't hold your breath...
You should keep in mind, that C206 is a Sandy Bridge compatible chipset. C216 is the up-to-date chipset natively supporting USB 3.0 and Ivy Bridge CPUs. And the desktop variant of C216 is the Panther Point platform, including H77 chipsets. DH77DF has been successfully tested with Sandy Bridge Xeons. I don't see a reason why it shouldn't support Ivy Bridge Xeons.
My thoughts exactly, it *should* work with ivy bridge xeons since the 77 series chipset is the companion chipsets for ivy bridge. So will it work, but intel is just lazy about updating the list of supported cpus? or will i need to wait for a bios update? can anyone confirm?
Well, I'm gonna receive an ASUS P8C on the 11th of August and will then order an Xeon E3-1225v2 for it. It probably will arrive around 13th / 14th. I currently have a DH77DF sitting in my Home-Server - if you're able to wait, I will test it for you! But to be honest, I really don't see a reason why it shouldn't work. The DH77DF received an update to support new processors on June 8th; this might be the Ivy Bridge Xeon support. Just make sure, that you're able to update your BIOS to the latest version with a compatible CPU. Chances are high, that the first BIOS version (0069 - released somewhen in February) doesn't support Ivy Xeons.