The solution is to render games at 1024x768, the same resolution as the ipad 2. Scaling it up to 2048x1536 is trivial if you just treat every pixel as four pixels on the display and will look just as good/bad as the ipad 2 does.

Can't believe this article got upvoted, there is no information about anything in it.

TLDR; iPad 3 has a resolution of 2048x1536.