I remember that notice earlier in the year, which seems to be quite genuine. However, there is a paid-for aspect to Mocavo, with the offer of a new similar-price sub to FindMyPast. So I wonder how hard FindMyPast will be advertising the free records that they hold - similar to the 1881 census (I don't notice either of the 2 main sites bring these free records to the forefront of their adverts).
I think that it will not be long before the "free forever" sections and the paid for sections become so integrated with existing records that the free aspect will be lost in the mists of time. I suspect that new researchers, and some older ones, will simply assume that they have to subscribe to the site to access the records, beyond indexes. I hope I'm wrong.