For a while now most people outside the walls of Apple have generally assumed the
iPad 3 would come with a 2048x1536 Retina display. The 2010
iPhone 4 introduced the idea of pixels so small they were almost invisible to the naked eye, and while rumors suggested the 2011
iPad 2 might make a similar leap forward, Retina displays that big just weren't in the cards. That was then. This is now.
Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/CJKQoldqH7M/story01.htm
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