But, forward-looking, update-obsessed people that we are, we can't help but imagine how Google's going to maintain the pace of innovation in its next version of its mobile OS, Android 5.0.

Google has announced that its next developer conference - Google IO - will take place from May 15 to May 17 2013, a month earlier than 2012's June dates. Given that Google announced Android 4.1 Jelly Bean at 2012's IO conference, it's not unreasonable to expect to see Android 5.0 at this new year's event.
For 24 hours, it seemed as though the first kinda, sorta confirmed feature for Android 5.0 was a Google Now widget, which briefly appeared in a screenshot on the company's support forum before being taken down. As it was so hurriedly pulled, many people assumed it was slated for the big five-o and accidentally revealed early.
As it happened, the following day, on 13 February 2013, the Google Now widget rolled out to Jelly Bean.
On 28 February 2013, we learned from Android Central that Google is working with the Linux 3.8 kernel, which gives rise to the notion that this kernel might make it into Android 5. One improvement that the 3.8 kernel brings is lowered RAM usage, which would mean a snappier phone with better multitasking.
Android Geeks has reported that Google Babble will debut on Key Lime Pie. Babble is, apparently, Google's in-development cross-platform service and app with the aim of unifying its various chat services which include Talk, Hangout, Voice, Messenger, Chat for Google Drive and Chat on Google+.
Android Geeks' source also said that Google Babble will be supported by devices running Android 2.3 and above, which would make sense given that Google will want as many people as possible on the platform.