Today the rumour mill flips again, according to FUD Zilla the G92 will in fact be a high-end GPU. The chip is slated for mid-November and will be a faster 65nm version of the G80 core.
The site also heard a rumour about another 65nm G9x GPU, possible the G96. They didn't mention any specifics of this GPU but perhaps this is the new mainstream GPU - if the rumour about the G92 being a high-end chip is true.