We reported earlier that the Nokia Lumia 900 was rumored to be exclusive on AT&T’s network only for a short period of time. Well for the good news for AT&T subscribers is that it appears the device could possibly be seeing a launch come March 2012. This is according to a Nokia developer newsletter that outed the release date and carrier. Unfortunately this appears to be only for the US launch with no mention for an international launch, so if you happen to be living outside of the US and you’re looking for when the Nokia Lumia 900 will be released in your country, those dates still remain pretty much a mystery for now.