Might the upcoming 15" upgrade continue with the Ti case? Perhaps just a CPU upgrade, possibly with bluetooth and/or a new GPU? Maybe they'd even include Airport Extreme on an internal PCMCIA card like the original Airport? Seems that the G5 has AE on a PCMCIA card.
Interestingly, MacWhispers (yeah yeah, their credibility isn't great, but thats not the point)
is predicting that the 15" will continue to exist in Ti for a revision.
this thread hints that the next 15" might have the same system bus.
Perhaps Apple will continue with the minor ~200mhz upgrades and the 1ghz will become the low end model? Would be interesting... perhaps a preferrable result.