2019 will be Cedar Point's 150th season, so could it be something big?

SANDUSKY, Ohio -- Another secret plan is brewing at Cedar Point.

The park has unwrapped its first tease for what's to come in 2019, which just so happens to be the park's 150th season.

The tease came in a Christmas video with park employees lip synching and dancing to Burl Ives' Holly Jolly Christmas.

Half way through the clip, a worker is seen excitedly reading a binder with a cover that declares, “2019 plans: TOP SECRET.” When two other employees try to sneak a peek at the plans, the worker quickly snaps the binder shut.

Watching closely, you can see the binder is actually empty -- but this is the first official taunt Cedar Point has delivered for 2019.

What could be coming? At this point, it's a complete mystery. But since 2019 is the 150th season, could we expect something big?

“Our heritage and our history is very important to us,” Cedar Point's Tony Clark told WKYC back in June while discussing the upcoming 150th season. “You're gonna see a lot of things that have to do with our history; little nods to what it was like in the past. You'll also see some new offerings in the park. As far as attractions go, we may go big, we may not. We don't know. We're still on that five-year moving things around playing the chess pieces figuring out where we want to put things. I can guarantee that it'll be a blast from the past.”

Until then, the park is preparing to unleash Steel Vengeance for the 2018 season -- a new record-breaking roller coaster that replaces the former Mean Streak.

Cedar Point opens in 2018 on Saturday, May 5.