WWE is currently negotiating with at least two states in the United States to make gambling on scripted wrestling matches legal.

CNBC reports that the WWE has hired the accounting firm, Ernst & Young, to find a way to prevent the company's match results from leaking to the public. This is the same firm that worked with the Emmys to help keep awards winners a secret ahead of their reveal.
WWE odds are currently available exclusively in foreign sportsbooks, but with limitations. In particular, bettors can wager a set amount and the odds favor the books. The reason for this is simple: the WWE technically rigs its matches. Because the WWE scripted, there's a risk of the results leaking ahead of the match.
The WWE promises it will withhold match results, even from the wrestlers, hours before the show. Unfortunately, this will not guarantee that someone who knows what will happen will look to make a quick buck.
Not to mention, gambling will inevitably affect WWE's booking decisions.
Nevertheless, if the WWE gets approval, it could pave the way for other non-traditional gambling opportunities. Ironically, this could be why this attempt will not get approved in Colorado and Michigan, as well as other states.
The WWE is slowly confirming its bookings for WrestleMania 39. The main event is still Cody Rhodes vs Roman Reigns. But, fans will also want to tune in to watch John Cena take on Austin Theory in a title match. Finally, Brock Lesnar will square off against Omos.