The Extreme Editions are Xeon dies which as you know, in the SB version they go up to 8 cores ( for desktop EE 2 are fused off, so only 6 ). It is perfectly normal for the 22nm version to hold 10-12 cores, otherwise. Most likely they will go 10 for desktop EEs and 12 for Xeons. Intel needs to slowly increase the core count to keep at least a 1:2 parity with BD and derivates.

Having said this, I don't find anything wrong with a 10 core EE.