Back in May, Microsoft announced their decision to openly share their platform roadmap via status.modern.IE. Yesterday, IE team announced another round of updates to their plan. These updates include new ECMAScript, Networking, Performance, Media, CSS, and DOM features under consideration and in development.
Additionally, IE feature statuses are also integrated into caniuse.com via our open data feed. You can also help us make this a valuable resource for developers by contributing to the open source project. As always, ask us questions and give us feedback via @IEDevChat.
| Feature | Status |
| Math Built-ins (ES6) | In Development |
| Number Built-ins (ES6) | In Development |
| String Built-ins (ES6) | In Development |
| Object Built-ins (ES6) | In Development |
| RegExp Built-ins (ES6) | In Development |
| Classes (ES6) | In Development |
| Template Strings (ES6) | In Development |
| dppx Unit for resolution Media Query | In Development |
| DOM Event Constructors | In Development |
| WAV Audio Support | In Development |
| Meta Referrer | In Development |
| WeakSet (ES6) | Under Consideration |
| Spread (ES6) | Under Consideration |
| Tail Calls (ES6) | Under Consideration |
| Subclassing (ES6) | Under Consideration |
| Modules (ES6) | Under Consideration |
| SIMD (ES7) | Under Consideration |
| ASM.js | Under Consideration |
| Clipboard API | Under Consideration |
Follow status.modern.IE for continual updates on the Web platform in IE.
Source: Internet Explorer blog