If iPad 3 (or, the retina iPad, since perhaps the next iPad revision will do nothing more than have a better screen resolution; A6 won't come out until next year at earliest) comes out late summer 2011 with the iPod and iPhones, it would be a swift and decisive strike against the other tablets emerging on the market.
Face it: A5 + "Retina" display + $499 would kill other pads in an instant. Even a finger hold HP would hope to gain would be obliterated.
Why nit an A6.