The iPad 3 release date expected to be in march. March 7th is a quite possible date. This also suits with the earlier versions of iPads release schedule.
ipad 3

The mobile chipset maker Qualcom anounced that the new fifth generation Gobi 4G LTE will be equipped in new versions of iPad and iPhone. The new Gobi v5 supports all 3G and 4G networks worldwide. If the new iPad 3 utilizes the Gobi v5, then it will be released on worldwide on same day. Becuase, there is no strain for Apple to divide the territories according to networks operational baseband.

Several reports states that the Retina Display has been provided with this new release. So that the new iPad 3 will be bundled with the A6 processor, LTE, Retina display as well as Better camera.