There is no "September" iPad. That whole line of rumor was created by accident, by Mr. Gruber speculating idly that Apple might want to sync up iPad's annual release cycle with the iPod, in the fall, coupled with his apparently inside information that this spring wouldn't bring a "Retina Display" to the iPad. (This is reasonable speculation based on the notion that, given current iOS, they would need to make a Retina Display on an even multiple of the current pixel density or force developers to support yet another screen type, implying a minium 2x density, and the available mobile GPU designs couldn't handle that. Lion based iOS might alter that assumption, allowing, say, a 1.5x higher pixel density by this fall.) In any case, they're clearly working to beef up the GPU in the iPad, but it will be a while yet before they can power a Retina Display and GPU in the same energy budget. Don't expect that until next spring, at the earliest.