This is a great release. I know a lot of people have been waiting for async/await downlevel support (transpiling async/await to ES3/ES5 for use in contemporary and older browsers), including some of my own projects.

Better type inferencing of course makes writing code better for everyone.

Also, somewhat buried in this announcement is showing off support for more modular lib.d.ts support, which is also something that has been patiently needed. (Up to now the basic types and expectations of the target ES version you were transpiling to were in big monolithic definition files making it harder to "pick and choose" as needed for your project: the most common case being one shown here that most browsers support native promises from ES2015 and/or are easily polyfilled, but you still want to mostly stick everything else to ES5 output code for the time being.)