If we go by last year, we will see an update to the iPhone and iPod Touch capacity. It's my feeling that doubling capacity isn't feasible, so Apple will take advantage of the dual flash chips in each device to offer a 50% increase. Meaning, the 8 and 16GB iPhones will have a 24GB model (8GB+16GB=24GB) for the two flash chips inside. The 8, 16 and 32GB iPod Touch would then have a 48GB model (16GB+32GB=48GB) for the two flash chips inside.
We have been programmed to think that you can only double capacity because of BASE-2 rules, but we are talking about two separate chips connecting to one controller that is aggregating the two flash sticks capacities into one. Many phones already do this by taking the limited 128MB Flash for the OS and adding it to the SD card of xGB when inserted. I don' have a lot of followers (if any) on this forum backing me up on this concept, but when you project the future of Flash there is no other option available until you want to make the iPod/iPhone model stagnant for 18-24 months at a time.
If the likely situation of new Mac notebook case revisions come out next week, then I think Apple may forego or skim over many other new products that are up for a revision. For instance, the iMac was updated in April with Montevina-like aspects to the chipset so we may not see a new one until MacWorld, or perhaps just a quite update to full Montevina. The only real changes will be some minor performance changes and power savings, both of which aren't going to matter to most iMac buyers. The Mac Mini is an odd situation that is so long overdue for a revision that Apple could just not update it again, cancel it or turn it into a whole semi-xMac machine that many posters here have been clamoring for.
I think the best thing we can except from MacWorld is a new product announcement, an in-depth demo of Snow Leopard and a whole bunch of stats of how Apple did in their first fiscal quarter and for the 2008 calender year.