Flagship doesn't necessarily mean GTX 480. For what we know the yields of the next revision might be good enough to harvest quite a few fully functional chips with 512 CUDA-cores. These chips then might be used for a Ultra 490.
Pure speculation on my part.
Additionally, the part of the report is just a list of what is known from the whitepaper... Xbit Labs doesn't claim GTX 480 will have 512 CUDA-cores either.
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