Houses are (and will be) in black in white mostly because of relations to some sort of media. Photography was black and white (Dead Exposure), and video/film was in black and white (Organ Room - Silver Screams). I'm not so sure this whole house will be in black and white, unless we're seeing it through photographs, film, or perhaps even a news paper. However, the only house to be currently rumored as a television/film themed house would be the Diaster! queue house. It has me quite confused, for I can't relate a presidential/red button crisis/ect. scenario to anything along the lines of the Diaster! house, which is expected to be holiday/t.v. movie marathon house. What is also confusing me is how a holiday and a t.v. movie marathon can link together, unless it was the President's Day holiday. But that still leaves me wondering why a President's Day room would be in black and white. Now, the actual room doesn't have to be in black in white. The photo just could have been edited to black and white, with a color splash on the red button. Perhaps A&D just wanted to hint that the photo is supposed to portray a room/house from a time in the past But who knows, it could always turn out to be the "ABC Family Presents: 25 Days of Christmas" marathon...
Another thing... the previous picture of the wooden blocks are in black and white, but noticed from other photos, the blocks aren't actually the colors black and white.
(Not trying to put your ideas down, just speculating as a whole...)