Unless they plan to release this 4-5 years from now isn't it a bit optimistic to release something intended to be used in production for IE11 only? For most real-world applications it's kind of nice to be able to support anything with a browser share over 1-2%, with this requirement it places Angular squarely in the 'startups for the tech crowd'-only world.
The intention is to use it with Traceur, which is an ES6->JS transpiler that works right now. It's like writing a framework in CoffeeScript or dart2js - users shouldn't care about the implementation language, the ultimate binary is just a blob of JS that works on browsers - except that the source code will eventually run natively in the browser.
