Apple (NASDAQ:AAPL) is expected to announce details of its iOS 5 mobile platform revamp later today during its annual Worldwide Developers Conference event, and the rumor mill is in overdrive with speculation over just what the update will deliver. The smart money is on system-level Twitter integration, as well as the introduction of over-the-air software updates, bringing the platform in line with rival mobile operating systems. Apple has already confirmed that iOS 5 will bring official launch of its iCloud digital streaming solution. Apple CEO Steve Jobs will deliver his WWDC 2011 keynote at 1:00 pm ET. Be sure to check with FierceMobileContent later today for complete coverage. Article