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Recent Android L build LRW87D Spotted in a Video with Major UI changes

A build of Android L for Nexus 5 recently leaked, the LRW87D of 25 September or near it, was found in the Chromium bug tracker regarding a problem with the crash of a few videos. It is captured in a short video clip.

Starting with Cupcake, individual builds are identified with a short build code like LRW87D . The first letter is the code name of the release family, e.g. L is likely Lemon Meringue Pie. The second letter is a branch code that allows Google to identify the exact code branch that the build was made from.The next letter and two digits (W87) are a date code.

The letter counts quarters, with A being Q1 2009. Therefore, W is Q3 2014. The two digits count days within the quarter, so W50 is September 25th 2014. Finally, the last letter identifies individual versions related to the same date code, sequentially starting with A. So D is the fourth version of that day.
Google states on their website that the date code is not guaranteed to be the exact date at which a build was made, and it is common that minor variations added to an existing build re-use the same date code as that existing build.