There is a label on the substrate in the left corner "R1", thus I'd say *it is* Socket 2011 not only that it looks like it. (Socket 2011 is know internally as socket R1). The different pin pads are not that interesting, probably only some debugging contacts, not needed for the final product.
I guess the "A4" print is the revision, but I am not sure, could be anything else, too.
Anyways, it is an early SandyBridge-E sample. If it is an 8 core part then the ebay prices are around ~$200, depends on the revision.
Can I upload your picture at cpu-world.com? That is normally the 1st address for weired chips, but yours is not in the database, yet.
Edit:
Checked the Sandy ES at ebay. All of them are labeled as "'10" in the first line, meaning 2010. But you have an 11 there, which is a bit strange. If you are lucky that could be an Ivy Bridge-E ES, i.e. 22nm, they are not launched yet. For more information you should try to get it running in a mainboard and get a CPUID screenshot.
Oh and "A4" probably means nothing, all of the other ES at ebay have it, too.