It's still a bit early to productively code in Leaf, but you're more than welcome to have a look around. We'll gladly help you on your way, either to play with the syntax, or contribute to the development.
You can head over to Launchpad to grab the source code. It uses the
scons build system and the
BUILD.TXT file has instructions on building and running. Only Linux and MacOS are supported at the moment.