Yes - TC39 is responsible for updating the standard (http://www.ecma-international.org/memento/TC39.htm), meaning that they all voted to approve the current draft ES2015. You can see several years of the drafts here http://wiki.ecmascript.org/doku.php?id=harmony:specification...

What approval means here is that it was ratified by the ECMA General Assembly. The move by TC-39 to send ECMAScript 2015 to the GA was voted on at the last TC-39 meeting around a month ago.