More and more evidence points to what is most likely the next build of Android. Still dubbed as Jelly Bean (but 4.3, as is since 4.1), this new OS version will most likely be unveiled at Google I/O coming two weeks from now.
It seems that reports flying aroud the web of Google delaying Android 5.0 Key Lime Pie (to give OEMs some breathing space) might be true with Android Authority's server logs showing multiple entries of Nexus devices running on the unannounced Android 4.3 Jelly Bean OS.
The build versions range from 4.3 to 4.3.1 and 4.3.2 as well, caught on various devices such as Galaxy Nexus, Nexus 4, Nexus 7 and Nexus 10. If this is true, we would simply be seeing another incremental update to Jelly Bean, much like the last 4.2 update (which brought gimmicky features such as DayDream, but a really useful one in the form of LockScreen Widgets).
Google I/O takes place between May 15 to 17 and we would definitely find out for sure if Google will indeed launch another iteration of Jelly Bean then.
Source: Android Authority