http://www.engadget.com/2012/11/08/...-9500-teases-xeon-e7-linked-kittson/#comments
Mac Pro Refresh?????
Mac Pro Refresh?????
Yes but the E7 certainly is x64.
Short Answer: No.
Long Answer: No. Apple will use E5 v3 CPUs in the next Mac Pro.
Mac Pro Refresh?????
E5 v3 isn't due until 2014 (probably second half '14 to boot). So an extremely unlikely move.
E5 v2 (Ivy Bridge ) is unlikely but possible if the rest of the new Mac Pro is SNAFU'ed enough that it can't come online before Q3-Q4 '13.
There is still even money chance the next Mac Pro will have a E5 v1 (Sandy Bridge) in it.
which falls into the "late 2013" promise by Tim Cook.