Here's my ideal lineup:
-full tower workhorse for hard-core gamers, film makers, etc. (Mac Pro)
-mini-mid tower (new computer)
-all-in-one desktop (iMac)
-pro laptop (MacBook Pro)
-consumer laptop (MacBook)
-combineTV & Mac Mini
-server (xServe)
w/ the iMac, laptops & Mac Mini, have a BTO option for SSD drives. W/ the laptops, let the displays swivel around and be able to use them as tablets. Add stylus & multitouch support as well so you can use your fingers or a stylus. Whichever you prefer. Also, have all the computers have dual-link DVI (either the full thing like Mac Pros or Macbook Pros) or through a dongle while also upgrading all the laptop/cinema displays to as high a DPI as possible and still inexpensive enough for the average Joe on the street. Plus, add iSights to the cinema displays.
SSD Drive on iMacs is dumb. The SSD on the Macbook Air arguably outperforms the platter based 1.8" hard drive. A 7200 rpm 3.5" hard drive easily outperforms any "affordable" SSD. Power savings are rather irrelevant in a Desktop (no battery).
Swivel-around laptop displays... this concept has failed already. It's fragile, feels cheap... If Apple was going for laptop/tablet hybrids, I'm sure they will find a better way to do it.
Dual Link DVI: possible on Macbook Pros. It's touch on Macbooks because space for the port is limited (thus mini-DVI) and the integrated graphics can't handle huge resolutions well. Very few people need to hook up 2 display to a laptop for a triple screen setup (I'm one of them though). It's also kind of annoying when the screens have different sizes (13" laptop, 20" display), relative resolutions (130ppi on the Macbook, 100ppi on the externals), finishes (glossy vs. matte) and colors.
It's more likely that Apple would replace DVI with DisplayPort or some Apple port that can output VGA, DVI and HDMI with adapters. VGA is crucial if you need to do presentations, most projectors, even recent ones, rely on VGA.