I'd think, since you can't preorder before the 16th anyway, just wait until the 16th before you start panicking. Maybe I don't know how SE runs it (aside from XI and XIV Im not really a fan of any SE games) but seems a little weird if we could get the ARR collector's edition from EB and the such here in aus, but not the expansions. They probably can't say for sure, either rules or lack of knowledge, until the 16th. The manager at my local EB often tells me little bits of information (like just recently how certain companies dont care if the game is sold before streetdate but others, like nintendo games, will get you fired if they go before the date) and he makes it sound as though they often don't know whats going on.

*shrug*

But then I dont make, release, or sell games for a living, so I dont know. Best just to wait a few more days.