Just chatted with Nelli, who referred me back to this thread. Quick update - there is none.

Q: How we will be notified about CAA record availability?

A: We will send emails to customers 


Q: Are you aware that deadline is 9/2017 for this?

A: We don't have update on it yet but we'll get that details once it is ready.


Guess at this point more people need to keep bugging till we get at least ETA.