According to a trusty source inside
Google, Android Key Lime Pie is
going to be delayed by 2 To 4 months, and won’t make it in time for the Google I/O 2013 conference.
The report comes from
GadgetTronica , who mention that the reasons for the delay isn’t so much in the development of the OS update, but rather Google trying to give OEMs a chance to get as many of their phones to Android 4.2.2 Jelly Bean as possible.and due to KLP delay Nexus 5 will probably delayed.