The over-$500 tablet war was, for all intents and purposes, over once the iPad 2 came out with a front- and rear-facing camera. It was the missing feature that kept some people from buying the original iPad and pushed sales of the sequel to a higher level than many thought possible. Still, there were competitors lingering with hopes of stronger reviews, more appropriately-sized screens, and most importantly a faster network. The last part may be changing if rumors of the iPad 3′s imminent announcement on March 7th are true. Here are the features that are being discussed” 2048×1536 Retina Display…