Source: Mike Florio, Pro Football Talk 
Commissioner Roger Goodell announced the Cowboys-Jaguars, Lions-Falcons, and Dolphins-Raiders matchups during a media event in London, where the Jaguars will host the 49ers on Sunday.
The dates have not been determined, but the time difference means that the games will be played at 1:00 p.m. ET on a Sunday. Also, look for the three games to be played before Thanksgiving, since the NFL prefers having no bye weeks after the fourth Thursday in November. Every team that plays in London gets a bye the following weekend.