According to this CNet article and a loose-lipped Alpha Top spokesman:
Apple Computer plans to release a larger-screen version of its recently introduced iBook laptop in July, according to the Mac maker's Taiwan contractor.
The new iBook, which Alpha Top will build for Apple, will have a wider screen and come in a variety of colors instead of the white version introduced May 1, said Alpha Top spokesman Wang Hsin-wu.
Sure... Apple denies it... :) But when have they confirmed a rumor?
Go2Mac has their own rumors regarding this "new" ibook:
According to sources close to the project, Apple is hard at work on a new PowerBook model that will sit neatly between the newly announced iBook Dual USB and the PowerBook G4 Titanium.