Not sure if D&R will continue after this season, but I think they will give it one more go at Worlds next month. They must have been a bit disappointed to finish below M-T&M since they are last year's World's bronze medalists.
Duhamel/Radford will continue and will be taking it one season at a time. So health permitting they are going to be competing for at least one more season.
I'm not sure I want to see P&B again after their less than gracious comments after the Dance event in Sochi.
I'd much rather have their honesty over the usual PC crap.