Other significant changes include a new type — called never — which is used for values that never occur, the option to define properties as read-only, private and/or protected class constructors, tagged unions type capability (hello Swift!) etc. The complete list of new features is documented here. Head to the Playground and test them!
TypeScript 2.0 is downloadable for use with Visual Studio 2015 and can be accessed via NPM, using NPM install -g typescript@rc. Microsoft also offers basic text editor support for Sublime Text, Emacs and, for the hardcore developer, Vim. My favorite text editor, Atom, has a TypeScript Plugin with support for formatting, code completion, navigation and fast compilation. For the Linux enthusiast, the latest version is available with Eclipse IDE.