I stumbled across this thread on Digital Spy:
Sky Premiership Coverage for Next Season
It doesn't seem all that clear yet, but it looks like some of the extra games will be made available as part of Sky Sports interactive, just like they did with some of the Champions League games this season. If this turns out to be true, what is the likelihood of ntl: customers being able to view the extra games? Given that Langley customers don't have any decent interactive services yet, pending the completion of the CR3 roll-out, I guess it's too much to expect that we'll have access to Sky interactive content (short of switching to Sky) any time soon.