I say Gt-200 will be based off G92/G92b/G94. The major difference is that it will finally be 55nm, 1ghz core, 48-56rops, 256+ Shader units, 6ns 2400mhz+ memory speed (maybe gddr4/5), 512bit memory bus, 1gb & 2gb Vmem, Increased TMUS, etc. The 9800gt provided the drop to 55nm, while the 9-series in general made a head start on the revamped PCB lay-out and redesigned PWM circuitry. The bricks have been laid, and as said before the prototypes have been out now for a while. The logical progression from the timeless GTX g80.

Think 8800 GTS [g92] in all its possible glory.