According to the rumour they're increasing the die size by about 20%.
Sure, they'll have a more powerful chip, but unless they do something to increase efficiency, too (something which the current generation of chips is lacking, compared to Nvidia) the cards will just have to contend with increased power consumption, heat, and noise.
As for me upgrading, I usually buy the generation that takes advantage of a new die shrink. I bought the 5800 series, then the 7900 series, and I'll be waiting for the 9900 series.
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