I Tweeted at Ludei last week and they told me that it was most likely coming last week. It has almost been a week on since that Tweet now, but hints that a newer version of CocoonJS exists and is ready. My game is being held back because of lack of Google Play Leaderboard as well.
This is my Tweet and Ludei's response: https://twitter.com/ludei/status/453177151362039808
Maybe I'll drop them an email. If everyone were to do the same, they might release the plugin sooner. Even just Tweeting at them might help.