There will be a G5 under the hood of the PB's at MWSF because although people talk of heat and power issues Apple has had 2 years to move the G5 into a PB case. The iMac was the first signal of this, they were at 2 inches 6 months ago and with smaller drives and what not, apple would be back to the 1 - 1.2 inch mark. Apple isn't going to let their coveted PB line languish behind consumer lines such as the iMac and by sounds of things eMac's. Because regardless of whether in real terms the PB's G4 may be faster than the iMac G5 it's still not a great marketing ploy having the consumer iMac and possibly entry level eMac with a chip a 'G' ahead of the professional laptop. Anyway it would seem that MWSF has an uncanny knack of releasing PB's with new processors, so hopefully this can aid the chances.
On the issues of power consumption and heat over the past 2 years since the G5 PM was released we have heard rumblings of new types of batteries and new heat minimisation components on a regular basis, all Apple would have needed to do is follow some of these new technologies, develop them and then we will see a G5 PB at MWSF. I still myself hold doubts as to whether we will see a G5 PB because may be the problems that have been outline may come to fruition, but i feel that the time is right and against most peoples thoughts that the technology is right as well.
I however doubt whether we will see 6800m GPU's in PB's anytime soon, those things are huge, have you seen the size of the Alienware 7700 which has it? Though it could eventuate because if they some how make it DLL you'd be able to plug atleast the 15" and 17" into the 30" display, (though i don;t know how many people that will affect)
MY PREDICTIONS FOR MWSF are a follows
PowerMac's
Dual 3GHZ - 1GIG DDR2 - 250 GIG - 6800GT 256mb - $3199
Dual 2.5 GHZ - 1GIG DDR2 -160 GIG - X800XT 256mb - $2599
Dual 2.0 GHZ - 512mb DDR2 - 160GIG - 6600 128mb - $2099
Single 2 GHZ - 512mb DDR2 - 80GIG - 6600 128mb - $1599
All with Dual Layer DVD-R's - All Duals with Liquid Cooling
PowerBook G5
NEW CASE
13" Widescreen - 1.8GHZ G5 - 512mb DDR2 - 80GIG - X600
SD $1899 - Combo $1699
15" & 17" Widescreen - 2.0 GHZ G5 - 1GB DDR2 - 100GIG - 6600m
15 "Only SD $2499 - 17" $2799
As you can see I believe it will be a Power MWSF, which is about time because everything seems to be iPod lately.
Some may say hopeful, others crazy, but i think this is the line up Apple needs if it is going to capitalize on the success of the iPod, and capture a little more than 1.9% of the computer market.