There are still a few references to SVN in the code. Especially the development environment is recognized by the .svn folder in PIWIK_ROOT.
A simple $ grep -R .svn . shows some more references.
In d48af430271d1b4b9ba9d42e4eac3b747feecabd: Properly recognize the development environment.
In 235405e0ab2466eb86c24dc33346e35652e80674: .svn dir does not exist anymore.
In 47b91225796b9f667ef83d3e8774abd442312361: svn export won't work anymore. Instead we do a git clone -b $VERSION
There is still a reference to trunk/ for nightly builds, not sure how that is supposed to work.
In a0e81a44a113d102dd37556a460797940941e0fb: Proper checkout of tag by version. Previous one was for branches..
In 073af4e5f8c4552520c0b5c57a2136beca62565a: Remove .svn references. refs #3736
In 39768c46337e8c76f29df3ab66b20af5a36ff65a: refs #3736