LED screens seem to be a given for the 15.4" as well as Santa Rosa goodies all round, but it seems to me that, if there is a WWDC announcement, it is not going to be a major update.
I would have thought that Macworld, Q1 2008 is way more likely to see major product revisions. Leopard will have been released and Penryn will be ready for new laptops, the price of flash memory will have dropped and bigger LED screens will be much cheaper. So you will get faster laptops with leopard support for flash caching, better battery life, better (hopefully higher res) screens, without the shocking price tag. A built in blu-ray drive would also be nice
I think I'm gonna save up for a nice 17" MacBook Pro 3.2GHz...