This may have been announced previously and I simply missed it, but in case it wasn't, I'll post it here.
According to NFL.com and the NFL Network, the AFC Championship Game next week will be played on Sunday, January 20th at 5:30 p.m. CST/6:30 p.m. EST.
With their huge win in Denver tonight, we know the Baltimore Ravens will be one of the participants. Tomorrow's tilt between the Texans and Patriots will determine who the Ravens will be facing. It'll also determine where the game will be, as the winner of Houston-New England is seeded higher than Baltimore.
Thus, a Texans win in New England tomorrow means the AFC Championship Game will be played at Reliant Stadium next Sunday.