Very interesting track that is making the rounds in the usual gossip corners. Now I have already decided SP will be my last CCIE (excluding CCDE), but Data Center would be very tempting. Wife would kill me though 
Apparently it will replace/consolodate the current Storage track which I think is a good idea. Storage in it self is not very appealing, but Data Center, if truly reflecting current and future real world Data Centers, then Yes, it is bound to be a winner.
In summary I would expect something to the effect of CCIE storage + CCIE RS less the routing. Possible devices:
Cat: 65xx, 49xx, 45xx, some smaller cats
Nexus: 5k, 7k
MSD 9xxx
Cisco ACE?
ACS
Realistically we will probably not see the high end devices and even then it will be a difficult track to prepare for due to the hardware.
Some earlier comments:
http://www.facebook.com/topic.php?uid=75717837879&topic=8511
Wow I’m totally in the same boat as you… CCIE SP will be my last CCIE, but Data Center is tempting…
I’m also thinking about the CCDE. I’ve read the better part of Optimal Routing Design.
Comment by ccie15672 — January 4, 2010 @ 2:39 am