I've extensively updated my WWDC '08 Speculation post. You can review all my predictions for the keynote, the event and the period around it by visiting the link, or review the newest information below:
"Rumoured pricing (UK) has the iPhone selling subsidised on contracts from as little as free, up through £100. Macworld UK is suggesting the phone will sell unsubsidised on a Pay/Go tariff at the current £269/£329 price points (16GB/32GB or 8GB/16GB)."
"the 3G iPhone will match the existing model in general design and material choice, though it's size may have marginally decreased."
"From there, Steve will move on to the software powering iPhone 2nd Gen and iPhone black/white - as well as existing iPhones and iPod touches. That OS is now called OS X iPhone. Expect this section to give details on the AppStore as well as new software features. Highly unlikely Steve will go back over the SDK itself, more on that will follow in the sessions.
Expect Steve to announce launch apps including some of those we've already seen."
"Expect revamp of look and feel - the web interface I mean - in line with the recent .Mac Mail revamp, expect some more cross-platform uses, possibly a free version, possible capacity bumps and finally, expect integration with OS X iPhone. What form this final integration will take is debatable, likely it is syncing of and access to data - I'm sure you can imagine what forms this will take.
Unclear placement on this next stuff, but from what we see, it is worth mentioning. Mac OS X Leopard has been rechristened OS X Leopard, in line with the new name for iPhone OS, OS X iPhone. This probably means Apple will outline the differences and similarities going forward.
Rumours have suggested Apple may seed an OS X Snow Leopard (Technically, 10.6 under these rumours though I speculate even under that theory, Apple is dropping the 10.x.x numbering scheme in favour of OS X Name Version x.x, or even OS X Leopard Version x.x), an update in the same vein as OS X 10.1 back in the day - focusing on security, stability, general fixes and so on. Additionally, the release is said to drop PPC support and remove or de-emphasise Carbon.
I speculate these rumours are either correct and OS X Snow Leopard is the codename for the first update to OS X Leopard under a new naming system and release schedule/system or they are referring to a third OS X.
OS X touch would be a hybrid of OS X Leopard and OS X iPhone, combining the mobile platform's touch control roots with more of the raw power of the flagship OS for what I am calling iNewton, but you might call Mac touch. Yes, the Mac Tablet. I speculate Apple will reveal the iNewton and its OS X touch OS here, preparing developers for it by talking about it in sessions & the keynote and also seeding a developers' preview ready for a full unveiling and release details/release this comign January. This version would remove Carbon entirely as speculated.
That said, if Snow Leopard is, as others believe, an OS X Mac (As I am now calling the flagship OS as a line in light of the new naming scheme for the OS X iPhone line - to that end Apple would be advised to give individual OS X iPhone releases small mammal names) release, named OS X Snow Leopard, Is till believe it will include pervasive Multi-Touch based on the OS X iPhone line and be destined to power an iNewton because of this. This version would include the Carbon tools, but Apple's own apps would all move to Cocoa/Cocoa touch."
"As for the Mac mini's belated updated, the predictions I initially posted with regards to the update itself remain unchanged, but I now speculate it may occur at WWDC after all. Rumours suggest Apple wished to unveil new MacBooks at WWDC but has been forced to delay by Intel. I speculate Apple will move the MacBook updates to last year's consumer desktop update timeframe (August) in a straight swap with this year's due desktop updates (Mac mini and Mac Pro)
To put it simply, I think Apple was planning to update the MacBooks here and the Macs Pro and mini in August and may now be doing them the other way around.
It remains possible both lines will go without updates."