Here's some news that will help you anticipate better what you're likely to see in the ad programming that shows in theaters before the trailers start.

National CineMedia has announced it will begin including previews from the Discovery Channel, TLC, Animal Planet and Travel Channel in its pre-show entertainment. The previews will be intergrated into National Cinemedia's "First Look" feature that also includes long-form movie previews and more.

Another major in-theater network, Screenvision, has said it is buying the assets of Cinema Screen Media. That purchase will expand Screenvision's reach to almost 15,000 screens for its ad network.

Heath Row, though, points out on his Advercise blog how most of the local-targeted ads that run in these ad pods aren't contextually relevant to the movie going experience. Instead they often advertise dry cleaners and orthodontists, services that might be fine but which are in sharp contrast to everything else the audience members are experiencing. Row hypothesizes that the expanded reach of these networks will open up the door to national advertisers or others. Even so, his point that advertising for carpet cleaning services is a far cry from the types of ads people are seeing now, especially online. There people are becoming accustomed to ads that roughly match the information they've just searched for or are reading. The sort of advertising dissonance in theaters can be jarring.