Is it demand or lack of inventory. Might well be why the USA lunch isn't till March.
This product was rushed to the market and rather then another delay RIM goes say, yeah we got them ready for sale but not worldwide. Now we see phones are already sold out. WHY, cause RIM doesn't have enough inventory on hand.
They might not even have 100% faith yet in the new phone and would like a small limit bunch out there just to see how it works in the real world and if needed tweak the product before the USA release.