heheheh... Antonella is correct, although not very much fun in the response!
As I'm sure everyone knows, things have significantly evolved both in how a Data Center is perceived as well as how Cisco is positioned in such changes. Where they used to JUST have storage potential, now things are so much more.
So I think we can all get a good idea of where things are going to go just by watching how Cisco markets and positions themselves in that arena.
I'd feel pretty safe in predicting that yes, there will be a full Data Center CCIE coming out. I'd also feel pretty safe in predicting that it will encompass the Storage aspects (so CCIE Storage as it is would likely cease to exist).
There never have been a lot of seats for storage anyway, so that problem has always been there!
Now, if >I< were the one running things (which, I am not even close!) I would retire the Storage track instead of pretending that it evolved into Data Center. There are SIGNIFICANT changes between the two, and I think it would be a great disservice to find someone who was CCIE Storage and "assume" that they would be equally aware of the breadth of Data Center things.
My intent is not to offend those who may very well do fine on both sides, but I don't think it's a safe assumption given the differences!
But right now, we're all about predictions and guesses. But knowing that Cisco puts a lot of work and thought into this stuff, I feel pretty confident about a good logical path.