They are actually discontinuing the Powerbook line as we know it. Instead, following on the heels of the rabidly successful iPod Photo, Apple will be releasing the iPod Jumbo in late 2005. The Jumbo will come in a 15" and 17" model
The Jumbo, which will look remarkably like the iMac G5 without the stand, will forgo the "Finder" and instead stick with the proven iPod user interface. Although focus groups have complained about replacing the keyboard and mouse with a click wheel, Apple has promised an improved speech interface, and has been working closely with third-party vendors such as Belkin and Griffin to develop "reasonably priced" add-ons to enable graphic design applications.
Needless to say, music capabilities will be key on this model, with iTunes being permanently enabled in all user's startup items. In fact, it is rumored that you won't be able to start up the iPod Jumbo without headphones or an external speaker attached.
Not wanting to leave the Jumbo out in the cold, they have modified the iPod Sock concept and will be releasing the iPod Robe, a svelte number that can be slipped onto the iPod Jumbo to keep it warm.
Finally, Apple will have an iPod to support video applications. I don't know about you, but I can't wait!