He's clearly bringing his experience and design ideas used in webOS to Android. Some of the features may have existed in Android before, but clearly he's driving the UX/UI for them in a direction based on work he did with webOS as well.
Its not just a checkbox for "yep, does multitasking", but how that is presented to the user. The "card" metaphor is very different than iOS "double click home, show row of icons"
The competition between the mobile OS is driving innovation and movement toward better design patterns that will be common between them. Notifications is a good example of something moving that way already and how iOS has copied notifications that are similar to Android, but also more so webOS.
