What Will The Future Hold?

Towers
The G5 towers have to break the 3.0 GHZ mark. Steve Jobs said that it would happen a year after the first towers were released, and now, almost two years later, the G5 Tower maxes out at only 2.5 GHZ. In the more distant future, expect to see dual core technology implemented in the G5 towers, Superdrives that burn at 32x, faster AGP graphics slots, and increased frontside bus speed.

iMacs
Apple's new G5 iMac is a killer machine. Expect the iMac to offer a 23" model in the near future, processor speed bump, and support for Bluetooth 2.0 - EDR. In the long run, expect the screen size to stay within that 17"-23" range, graphics card boosts (possibly an AGP port instead of built into the logic board?), superdrive improvements, and more RAM slots.

Powerbooks
The Powerbooks just received a long-overdue update, but big changes should be coming to this powerful machine. In the distant future, look for HD displays, a G5 (possibly dual core?) processor, amazing graphics cards and a 32x Superdrive.

iBooks
The iBooks seem to always be chasing the Powerbooks and I see no change in this senario. The next update should have Bluetooth 2.0 - EDR built into it as well as a Superdrive model for the 12" iBook and larger hard drives. In the far off future, expect the iBooks to have the same features as the current '05 Powerbooks.