Cookie Monster
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4Gamer.net says there are rumors about a 40nm GTX 260 in industries since September: http://www.4gamer.net/games/095/G009528/20091105001/
Could this be the supposed GT212? Specs say 216SP, 256bit (possibly for GDDR5?) and DX10.1. Looks like a GTX260~275 filler depending on its clock speed.
That roadmap seems to make sense, using the GT21x as a filler til the rest of the DX11 Fermi derivatives arrive.