Cedar Fair has announce that indeed Knott's will be getting Pony Express for next year.
Here's the press-release regarding The Pony Express.
I've read that Knott's has already removed Wilderness Scrambler and starting to clear up the Big Foot's Broiler.“First Class” thrills will truly be delivered to guests at Knott’s Berry Farm in Buena Park, California with the debut of Pony Express. Riders will saddle up on one of two, 12-passenger trains, riding “horseback” as they are launched forward at the beginning of the ride. Featuring low-to-the-ground maneuvers, hairpin turns and steep banks, Pony Express will be ready to thrill riders in the Ghost Town section of the park.