Steam does this a little bit with their voting system on which game will be included in their next flash deal. Sony's going to soon let the public do the talking as they will roll out a feature to let people vote on the free game being offered for the upcoming month.
There were be a list of titles and for the first promotion, the runner up will be offered at a discounted price. No word on if they will keep doing that, but it's nice to see that there will be a voice on what games will be available for free.
More info will be available soon, but for now, Sony just wanted to get the word out there that this will be an upcoming feature.