Before a new release the Emacs maintainers make a “pretest” release of the EmacsDevelopmentSources. There are binary packages for pretests available to Windows users, but otherwise its just a source package – see BuildingEmacs.
http://sourceforge.net/projects/emacsbinw64/
I tested this on 2014-06-29 (Windows 8, 64-bit) and it seems to work well, with image support and all. – MaDa
http://sourceforge.net/projects/emacs-bin/
I tested this on 2014-06-29 (Windows 8, 64-bit) and it seems to work well.
These binaries are packaged as given by “make install”, so they don’t bundle binaries of optional external libraries. See [1] for instructions on setting up a runtime environment with those libraries.
[1] http://git.savannah.gnu.org/cgit/emacs.git/tree/nt/INSTALL.
http://semantic.supelec.fr/popineau/programming-emacs.html#sec-2
This is a trunk release updated from time to time. Compiled with MSYS2/Gcc 4.9, optimized, with all supported libraries.
See also EmacsReleaseDates.