PowerPage posted a rumor that a 17-inch iMac model is in the works.
Meanwhile, Hiro had previously submitted an unverifiable rumor to Macrumors that upcoming products included: 100mhz speed-bumped iBooks, ADC-out Powerbooks, and a 17" CRT iMac.
This rumor was previously unpublished due to the lack of supporting evidence... but may provide some information in light of PowerPage's rumor.