Apple's yearly developer conference should see iOS 8, OS X 10.10, and likely some hardware.
Navigon Demonstrates GPS Navigation Multitasking in iOS 4
In the video, Navigon's Bernd Hahn demonstrates how a user can quickly switch to Safari to look up information and easily return to their navigation application. As an additional example, Hahn demonstrates how to accept an incoming call while in the Navigon application, allowing voice guidance to continue in the background during the call. Upon call termination, the Navigon application automatically comes back to the foreground and full navigation resumes.
Multitasking will be support on the iPhone 3GS and third-generation iPod touch with the launch of iOS 4 next Monday, June 21st. Apple's iPhone 4, launch on June 24th, will obviously also offer iOS 4 with multitasking support.