This page is helpful.
I was affected by the SFO change. Didn't have anything on the website at the time IIRC. I just got some weird e-mail to call them. They were trying to make me take a later flight, but luckily I got them to give me the red eye the day before so I still end up at my destination on the same day, although I've got a REALLY long layover as I've got the same connecting flight.