If you want to live dangerously, you can try the unofficial pandoc-nightly builds, or install the still-in-progress pandoc from GitHub. You'll need git and stack. Grab the stack binary that is appropriate for your platform and put it somewhere in your path.

Then:

git clone https://github.com/jgm/pandoc
cd pandoc
stack setup # only first time
stack install

The stack install command will let you know where it put the pandoc binary. You may have to add this location (~/.local/bin, on linux and OSX systems) to your path.

For more info, see also CONTRIBUTING.md