For your information up until and including ArmAII releases were staggered, first in the east European countries with fixed language pbo's.
Then Germany with fixed language pbo, after came the €uropean release, English/French & other, last of all the America's got their version.
All this over a period of about six months.
I have a German copy that I purchased because I could not wait for the €uropean release which came along 6 weeks after, iirc.
The time between releases dates was used to steadily update and optimise the game before hitting the major markets.
BIS moving to the Steam platform is a major change in marketing stratergy for the company while at the same time allowing to gradually build and optimise the game, alpha - beta - full release and continuing with sitrep & dev build updates which in a few days will result in the first installment of the SP campaign.
So, if not for Steam and the change of direction from BIS the US of A would be the last to have access !
That being said, I have no idea how the release will be handled, first there was talk of batches and keys for vip's, then perhaps pre-alpha and a lot of speculation thrown in just for good measure.
I'll ask him (?) later on today, sometimes he (?) answers questions, sometimes he (?) plays coy.