Intel iBook Processor Speculation
Apple's MacBook Pro was upgraded from 1.67GHz and 1.83GHz models to 1.83GHz and 2.0GHz models respectively. In additional there is an option for a 2.16GHz Build-to-Order model. To review, Intel presently has the following Yonah processors in their product line:
T1300 (Single) - 1.66GHz
T2300 (Dual) - 1.66GHz
T2400 (Dual) - 1.83GHz - MacBook Pro 1.83GHz
T2500 (Dual) - 2.00GHz - MacBook Pro 2.00GHz
T2600 (Dual) - 2.16GHz - MacBook Pro BTO
Low Voltage Versions
L2300 (Dual) - 1.5GHz
L2400 (Dual) - 1.66GHz
While it appears there is no reliable information available on what will be used in the Intel-based iBook, the Single Core T1300 1.66GHz model has been mentioned as the possible candidate for use in the upcoming iBook. With the upgrade of the MacBook Pro line into the 1.83GHz+ models, it opens up the possibility that Apple could use the 1.66GHz Dual Core processor in the iBook.
That being said, previous speculation by ThinkSecret suggested that Apple was planning on using the Dual Core Low Voltage version of the Yonah processors (1.5GHz and 1.66GHz) in the Intel iBook.