I can't find much detail about this anywhere yet, but there are vague statements about thow they will be allowed to keep parts of the Anglican tradition which does not conflict with RC teaching. So, on that basis, they would be under the same rules about issues like birth control as RCs always are (which not all decide to obey...)
There is also talk that they are to be allowed their own "oversight", so effectively there would be an "RC Lite" bishop, who would be able to ordain candidates, and possibly also including married candidates. The CofE married priests who transferred before haven't had to divorce or become celibate. But this would widen that little chink a bit further.
But RC priests marrying is a massive practical issue, not just theolological but also practical - housing, income etc would have to be changed massively.