This and Civil War are the only 2 Marvel titles that are OOS. It took Civil War at least 3-4 days, I don't remember exactly how long it took but in a little over a day The Hulk went OOS from what I remember? I'm not a big Zavvi person so someone could clarify if my timing is off a little bit.
I agree with a lot of Virik's points
Only current Marvel title limited to 2000 copies, and there are quite a few similar ones that have been in stock for a while, Iron Man 2, CA:WS, ect. The Hulk isn't any more of a popular tiles than those and many others titles. The 2 big differences is that's it's 5$-12$ cheaper and the print run being 2K means all the rest of the Marvel titles are at least double the print runs, it also doesn't hurt that it is a lenti. When Zavvi doesn't say with big titles like Marvel you can be sure 9 out of 10 times the print run is 4K or higher.
Yes it will come back in stock, but this will sell out before the preorder date if I had to bet.