My 2 cents: So far, Directv has carried all the additional channels NBC has made available during the Summer and Olympic games. Bandwidth isn't an issue on Saturday mornings, except during The Masters and the tennis US Open - and we are only talking about 2 Saturdays during the entire EPL season. NBC has said the overflow channels would be available at no cost to NBC Sports Network customers.
The only way that I can see Directv not carrying the overflow channels is if Directv has a channel dispute with Comcast about the actual NBC Sports Network. Short of that, I'd expect the channels to be available and I'm really looking forward to the 13/14 EPL season!
Will they be in HD??? comcast systems don't have a lot room for part time HD channels.