The retention bonus at 9E will eventually be rolled into pay rates, that is pretty clear. I don't know about $60/hour, but the idea is they would like to offer a better compensation package than RAH.
So expect first year pay north of $40/hour.
When this will become reality and not speculation is anyones guess, but they have been negotiating for a few months now. I would expect something by end of year 2016.
With all of that said, there is still $46,000 of retention to be had at 9E.