TeX Live 2013 has been released. TeX Live is a comprehensive TeX and LaTeX system running on Windows, Mac OS X, Linux and other Unix operating systems. For Mac OS X, a special version MacTeX 2013 is available.
Some of the changes to TeX Live 2012:
The top-level texmf/ directory has been merged into texmf-dist/.
MetaPost provides native support for PNG output and IEEE double floating-point support has been added.
XeTeX has been significantly updated with Graphite2, HarfBuzz and Core Text on the Mac.
LuaTeX now bases on Lua 5.2 and contains a new library pdfscanner for processing external PDF pages.
xdvi now renders with FreeType instead of t1lib.
microtype supports protrusion with XeTeX and LuaTeX and font expansion plus tracking for the latter.
tlmgr works better with with multiple repositories.