This is surprising, and it's odd that they haven't announced it to us first. The only thing they announced months ago was the beta version of the "General Social Network Communities License"; in which all images would have a base price of US$5, and if the buyer wanted to purchase more licenses for friends these extra licenses would cost US$1 each.
Months ago too Elena asked about subscriptions, but it wasn't subscription in fact, but discounts like in this example above. I am ok with discounts for mass buyers. But anyway, Elena assured me that we would be able to opt out.
The notice doesn't make clear how the subs are going to work. I'll write her.
Regards,
Adelaide