The Seahawks released this message from the NFL today:
NFL Announces Time Change for Chicago Game
Kirkland, Wash. – The NFL announced this morning that Seattle's original Sunday night game on November 18 vs. the Chicago Bears has moved to a 1:15 p.m. (PT) time slot. The game will be shown on FOX (channel 13 in Seattle).
Later that evening, the New England Patriots at Buffalo Bills will be televised on NBC's Sunday Night Football.