The date code on the A5X suggests that it was manufactured sometime between November 14th and November 20th of 2011. Another point of interest in the photograph is that it appears the board is sporting a pair of 16 GB flash memory chips manufactured by Hynix.
While it is obviously not quite an A6, we would assume that an A5X is a more powerful version of the A5 that is currently featured in both the iPad 2 and the iPhone 4S. Now the question is, how much more powerful, and why not an A6? Rumor has it Apple will make an official announcement about the next iPad at an event scheduled for March 7th. We will have to wait until then to see how much of a boost this new A5X chip offers over the previous A5.
source: MacRumors via AppleInsider