WTHR in Indianapolis tweeted that WOF will be moved to a digital subchannel so the station can air a expanded one-hour NBC Nightly News devoted to the Dallas police murders. (ABC or CBS, AFAIK, have not announced any plans.)
So if a game show (J!/WOF, etc.) is on at 7 on an NBC affil in your area, it might have be on another channel.
Brian
UPDATED: CBS is airing an expanded one-hour Evening News.