Straight from the horses mouth.

Quote Originally Posted by EVGATech_JacobF
The X58 Classified (E759) was a Limited Edition SKU as noted by the included certificate.

The X58 Classified (E760) is the long term SKU.

BIOS updates for E759 will continue alongside E760. Also, E759 motherboards have been put aside for RMA needs if necessary.
http://www.evga.com/forums/tm.asp?m=100685264&mpage=3