Matt,
The way it works is this... The OOM packages (Center Ice, NBA League Pass, etc.) is a rights fee paid directly to the League this allows Dish to resell the rights to all the games they have access to Out of Market subscribers. This precludes Dish is carrying the regional channels the games air on.
This means if you have a OOM package DISH will be unable to provide games from any RSN they are no longer carrying. If a another RSN is carrying the game then Dish would be able to carry that RSN's feed of the same game.
If I was a Center Ice or other OOM package subscriber, I'd be PISSED, BTW I did have Center ICE the last 2 seasons. NHL Center Ice is in free preview until October 23rd. Be aware the US version of Center Ice is unable to provide any games where both teams are Canadian, So a game in Toronto where they are hosting any other Canadian team will not be available on Center Ice.
John