Shimano Dura Ace Pedals: 7900 or 9000?

So do I want for the Shimano 9000 series or just pick up a pair of the 7900s?  The wife wants to inherit my current Ultegra pedals so I thought it would be a good time for a pointless carbon upgrade.  I like my logic.  But it looks like the PD9000s just aren't out yet but the 7900s are starting to get discounted.  Maybe I should wait for the PD9000s to ship so the 7900s will drop even further.

Or maybe just splurge on the 9000s...

Shimano PD9000