I think Ancestry is about to launch another dataset. There is an advert up on the site that says “Search for Freemen of the City of London”, but when you click on it you get taken to the London parish registers.
I’ve noticed that Ancestry often puts up the advert and then follows a few hours later with a working link. So if you think you have Freemen on your family tree keep an eye out for the advert and try your luck by clicking it.
Sure it won’t be long before they get it up and working