Cheap, passive, GK208-based boards. http://www.bit-tech.net/news/hardware/2014/08/13/geforce-gt-720/1
That's super cute! A double-slot passive heatsink seems a big on the large size, for a card that only kicks out 19W, but I'm sure board partners will come up with smaller solutions (and we'll see half-height, single-slot passive solutions, which will be nice).
Odd question, I have a GT440 as a physx dedicated GPU so I will probably upgrade that to this. There are passive cooled and fan cooled models. Would it be better to have the single slot fan or the passive cooled. My main GPU is an GTX780.