As a general note, I'd prefer to remove ES versions, especially future ones. Version numbers are not very meaningful, and it's not guaranteed that something will land in a specific version.
Just want to add that async function is already implemented in Microsoft Edge Windows Insider Preview Build 10532+. So this is a good time to add that entry in caniuse.
Searched for "await" today and was surprised not to find it in this awesome site.
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Landed in Chrome Canary recently
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For the time being see http://kangax.github.io/compat-table/es2016plus/#test-async_functions as always, but I'd like to see this on caniuse, too.
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Firefox:
Support for
async/awaithas been added in the Nightly build from the 31st of October (bug #1185106). Great stuff!
via https://blog.nightly.mozilla.org/2016/11/01/async-await-support-in-firefox/
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Now available at http://caniuse.com/#feat=async-functions
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Searched for "await" today and was surprised not to find it in this awesome site.