If i were asked to guess, I would compare the specs of the 64 and the 62 (I assume that the 64 is the 62's replacement, as they are both in the 60's...) and see that there are very few differences. Smaller, more inputs, hopefully HDMI 1.3, but that is about it. I then think to myself, what has Sharp been doing for the last year? Figuring out how to get an extra HDMI input on the side of the panel? Somehow I doubt it. Unless Sharp is about to drop a major bomb on us at CEDIA with some major change in a different model that they have not made any mention of (ignoring their 100,000:1 CR thingie they have going on, thats next year I think) I speculate that they have spent an entire year solely on fixing banding.
So my official speculation: Last year's TV's, minus 1" on each dimension, plus 1 HDMI on the side, and NO BANDING (or very minimal).