Apple hasn't changed its late summer delivery date since the company Mountain Lion in February, so it's a good bet that the next Mac OS will be showing up sometime this summer. That said, "summer" can mean anytime from now until September 21, so don't get your hopes up for Mountain Lion to be ready on Day One of WWDC.

No, you won't be running your iOS apps on your Mac (at least, that we know of), but Mountain Lion is all about integration with Apple's mobile operating system. Familiar applications like iCal, Address Book, and iChat have hopped aboard and will go by and , while iOS-only apps like Notes, Reminders, and Game Center will make their grand debut on the Mac.