Just summarizing the updates from: https://github.com/tc39/agendas/blob/master/2017/07.md

Can discuss changes as they pertain to Babel implementation (syntax).
babel-polyfill implementation is https://github.com/zloirock/core-js

EDIT: made some issues for Babel updates

New Proposals

• Binary AST 🙌 : Stage 1
• Optional Catch Binding try {} catch {} : Stage 3
  • Add optional catch binding to stage 3 preset babel#6032
• Throw Expressions throw new Error(''): Stage 1

Moving Forward

• BigInt 10n: Stage 2 to Stage 3
  • BigInt (Stage 3) [WIP] babel#6015 (we're not going to put in a stage preset given perf issues)
• Numeric Separators 1_000: Stage 1 to Stage 2
  • Add numeric separator to stage 2 preset babel#6071
• export-ns-from export * as ns from 'mod': Stage 1 to Stage 2 (also "consensus PR")
  • Split the export-extensions plugin into two babel#6075
• Class Fields class A { #a = 1; b = 2 }: Stage 2 to Stage 3
  • Update Class Fields to Stage 3 and change default behavior babel#6073

Needs work

• export-default-from export default from 'mod': Stayed at Stage 1
• Decorators @a class A{}: Stayed at Stage 2
• Optional Chaining a?.b : Stayed at Stage 1