Important: you can opt out from DPC on fotolia web site My Account > My Profile > Contributor Parameters > Sell my files on DPC - click Modify (Make sure the text now reads "Don't sell my files on DPC") and Save parameters.
Rread this post and this forum thread to know why it is important to do.
Consider reading the following post on SS forum, too - http://submit.shutterstock.com/forum/viewtopic.php?p=2679199#2679199
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Some of you already know about new Fotolia's child site Dollar Photo Club.
DPC offers High-res images and vectors, unlimited print runs, unlimited image use for just 1$ per image. Fotolia says that it's just another subscribtion plan and the licence is equal to FT Standart Royalty-Free license, and that this site is only for selected group of volume buyers. The reality is different: anyone can become a member of this "Club" just for 99$ a year which includes 99 high-res image downloads, unused downloads transfer year to year and you can buy a lot more additional images for just 1$ per image whith no runs limitation at all.
If you have portfolio on Fotolia, all your images are already represented on Dollar Photo Club(dot)com. And of course no opt-out.
According to the Fotolia's CEO Oleg Tscheltzoff interview they are going to invest big money into advertising. I guess soon can say "goodbye" to credit/on-demand purchases on FT, SS and more.
There are lots of discussions going on about this issue on Russian speaking forums. Many contributors don't agree to participate in the "Club".
So what we have to the date..
Today FT closed related thread on their forum http://us.fotolia.com/forum/viewtopic.php?id=44095&p=2.
FT representative came to main Russian speaking forums and instead of answering contributors doubts and questions started to copy&paste standart FT support BS.
Today some volunteers started the developing of petition website boycottfotolia.org. There will be a collective petition to Fotolia requesting opt-out function from the DollarPhotoClub or at least introduction of 1) limited runs, 2) reduction of the available sizes from XXL до L, 3) raster copies instead of vectors. The site will also show number of people signed the petition and number of deleted images. English and Russian versions will be available. I'll try my best to update information regarding boycottfotolia.org developing.

Acording to this thread http://www.microstock.ru/forum/showthread.php?t=14084 today (April,25) Fotolia lost 5000+ images/videos and counting.
A lot more images will be deleted on May,1.
Today MicrostockSubmitter developers kindly introduced new free feature "Remove Fotolia images"
It will help to save your time. You can delete any number of your files. Files are deleted sequentially, so you can cancel the process any time. You can choose to delete top or least downloaded files.
So, welcome to join Fotolia Deactivation Day - May, 1.

UPDATE: boycottfotolia.org petition website is up and running, both English and Russian versions are avaliable. Please, support and share. 846 contributors have already signed petition (as of April, 28). Thank you.
Consider reading this important information.
UPDATE (April, 30): read my Reply #379 in this thread.