From the Sunday Night Football memo released before the season:
FLEXIBLE SCHEDULING:
The 2007 NFL schedule will utilize flexible scheduling in Weeks 11-17. In those weeks, the schedule will list the games tentatively scheduled for Sunday night on NBC. Only Sunday afternoon games are eligible to be moved to Sunday night, in which case the tentatively scheduled Sunday night game will be moved to an afternoon start time. Flexible scheduling will not be applied to games airing on Thursday, Saturday or Monday nights. A flexible scheduling move will be announced at least 12 days before the game. For Week 17, the move may be announced six days before the game. Flexible scheduling will ensure quality matchups on Sunday night in those weeks and give surprise teams a chance to play their way onto primetime.
The Pats don't have any games that can be moved to the late-night spot on Sundays. Starting with week 10, they have 4 games starting at 1, one Sunday night (which can become a 4:15 start), a Monday night game, and a Saturday night game.