To make it easier to try out the very latest in TypeScript, we're now publishing the TypeScript nightly npm package. You can try this out using:
npm install -g typescript@next
We've set this to update each night, and we timestamp each release. You can see what version you're on with the --version commandline switch:
C:\Users>tsc --version
message TS6029: Version 1.6.0-dev.20150727
Please note: since this is the coming straight from the bleeding edge source, it may have bugs or incompatibilities. If you find any, please let us know the usual way.