These past few weeks have seen the rebirth of the GT200 leaked spec craze, after the relatively quietness of the 9800 GTX/9800 GX2 marketing blitz.
Only a few loose bits seem to be common among them, namely, a 512bit-wide memory bus (GDDR3, probably) and between 192 and 240 scalar processors for the core.
Things like the process technology (55nm, 65nm), TDP, performance, etc, are huge clouds so far.
Frankly, it's too soon to be speculating about a massively reworked architecture.
Even if it's a dual-core chip tied by an internal NF200-style bridge (different from a MCM-style layout, mind you...), i sincerely doubt that it's much more than G92 with a few extra execution units, double-precision (for CUDA, as it's mostly useless for graphics rendering right now).
The reason is that broad acceptance of DX10 in most games is still in its adolescence, and DX11 is still quite a few years ahead. DX10.1 support is also in doubt, and for good reason, as Nvidia doesn't seem to be interested in retro-actively aiding in game support for the competitor's current GPU's. It looks like DX10.1 will follow DX9's SM 2.0b into historic obscurity.
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