Android 5 was announced at Google I/O in June and includes a number of new features including:
- Improved user interface. Google calls it "Material Design"
- Expanded notifications
- Improved battery management
- Integration with Chromebooks similar to what Apple has done with iOS and Mac OS/X Yosemite (Continuity)
I've been running a beta version of Android 5 on my Nexus 7 (2013) tablet with good results. I've been testing both consumer and enterprise applications as part of IBM's internal upgrade plans. With over 100,000 mobile devices in use including both corporate-owned and bring your own device (BYOD), IBM is a mobile business.
Androidpit has a great video with an overview of the new features
Update 5 November: While Android 5 is now available for Nexus 5, the update for Nexus 7 and 10 are delayed until November 12