When I heard the announcement, I was very eager to cancel my current paid Ancestry membership and get started with a free membership instead (as well as new memberships to Findmypast and Myheritage). However, since February I haven't heard any updates about it.
Well, today I decided to do some searching and found that it is really easy to get your free accounts. Simply go to familysearch.org/partneraccess and you can create a free account to each of the three websites! It takes a mere matter of minutes. Happy searching!