Update: The information we had on the March 2014 release appears to have been erroneous. Looking at this picture by Allen Tran, the sign clearly says that this is a January 2014 release.
My opinion? I have to say that I’m surprised at the choice of set to unveil there — the last two Comic Cons saw the unveiling of iconic and much-demanded sets (the updated TIE/ln, the Queen Amidala minifig, and the Rancor [with its pit]), while the AT-AP has but a fleeting appearance in Sith.
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(Thanks to member CM4S for the tip and to The Brothers Brick for the picture and set details.)