This is a WSJ article so it requires a subscription or you'll have to find some other way to read it but it's recommended - interesting stuff.
Basically the concept is that operators could sell their real estate holdings and then sign long term management deals with the new owners of the real estate. This lets them monetize these assets and many of these companies like Harrah's or MGM MIRAGE are sitting on billions in real estate.
From the article by Peter Sanders:
"Blackjack players who are dealt a pair of aces often "split" the cards into separate hands, giving them two shots at hitting the jackpot. Now, some casino companies are considering a split of their own: effectively dividing their real-estate assets from the operating companies that run the casinos."