If it were anything nearly as complex as some of the WaW/BO1 EE's, then it may not have been found yet-- considering (and don't quote me) that not all of the BO1 EE's have been solved/found. I seem to remember reading somewhere that the zom team has verified this.
MrM- no significance as of yet. Kinda odd that the display only happens after you jump through a portal, no? Yer probably right, it's most likely nothing. But, I personally have not exhausted the possibilities enough to say it's nothing quite yet, and I'm sure nobody really has, because the other maps are taking up everyone else's time (and even though I really like Tranzit, a lot, I've seen the general opinion that most people hate it, a lot).
I'm just not one to dismiss so easily, and I usually base that on my own experiences and self-tested theories.