No one seems to know why or for how long yet.
http://www.reuters.com/article/2012/02/16/us-colbert-break-idUSTRE81F1DL20120216
http://www.reuters.com/article/2012/02/16/us-colbert-break-idUSTRE81F1DL20120216
http://blogs.wsj.com/speakeasy/2012/02/16/stephen-colbert-suspends-production-of-his-show/Stephen Colbert has suspended production of his satirical comedy show temporarily because of an emergency in Mr. Colbert’s family, according to people familiar with the show.