In a surprise move, Nxt client developer Jean-Luc has released the Nxt source code a month earlier than planned today. The original release date was planned to be the 3rd of April.

You can find the post here.

The source code can be found at https://bitbucket.org/JeanLucPicard/nxt/.

The Master branch is still 0.7.6, develop is 0.8.3 plus latest unreleased changes.