During the course of its iPhone OS 4.0 Sneak Peek event today, Apple noted that the operating system software will be available in at least three different versions: one that is fully feature-enabled with multitasking for the iPhone 3GS and 2009 “third-generation” iPod touch, one that is limited by the less advanced hardware in the iPhone 3G and 2008 “second-generation” iPod touch to not support multitasking, and finally, a…