As part of the launch of the MacBook, Apple apparently removed the last remaining PowerBook, the 12-inch model, from its site earlier today (Apple also killed the iBook brand, but we don't really see anyone missing that nearly as much).
It seems to be more conjecture than anything, but AppleInsider has some rumoring from "people familiar with the company's plans" that say Apple is planning a Front Row equipped " iBook" this spring.