I work at GameStop, and there is two unnamed skus under the system category for pre-order. There is also a Playstation 4 and Xbox One game category now with about 20 unnamed games for pre-order under each as well.
The moment Xbox One is announced for pre-order in an hour or so, that leaves only one sku unnamed... I wonder what that could be?! I'm going to pre-order before it's formally announced!!!