When foto-foto are released, Summit hardly notifies anyone. LOL However, we do have one official (well, two if anda count Bella's hand with feathers) foto that was revealed in EW last month.
This is the only foto (minus the picture from Bill Condon's twitter) that has been released from the movie. Other foto-foto are probably manips.
Again, when they release photos, they hardly ever announce that they are releasing foto-foto unless it's for promotion. If anda are talking about the teaser posters, they probably will announce it. Summit loves to make a huge fiasco about posters atau trailers haha It'd actually be kind of cool if they had a mini trailer for the superbowl atau something :P
But anyways, we won't see any foto-foto of Breaking Dawn unless 1) Summit tells us (which is rare), 2) they're leaked (which is not impossible), atau 3) for promotional reasons. However, I'm sure they will release some soon. They still have about 3 months til BD wrap, but I know they know peminat-peminat are itching for something.
However, I'm sure sejak summer, we'll have a teaser trailer. I'm thinking May. Possibly April. Rob's Water for Elephants movie is in theatres in April. I wouldn't be surprised if Summit tried to promote BD then.
Sorry, off topic. Answer to your question. No, we do not know when official Breaking Dawn foto-foto will be released. We only know of one (possibly two if anda count the Twitpic) official foto-foto and that's from EW. :) Hope this helped!