I have a theory. They usually start filming in April. My guess is that they have something to do with the eclipse that happened on April 8. Just a guess based on nothing but it would be neat if they did!
Fun fact: I met Jon Montgomery at Calaway Park this year, he was just there with his family hanging out. Very recognizable voice when you've watched the show and he was chatting with someone waiting for his kids to get off the same ride as mine. Seemed like a nice guy, I didn't wanna bug him too much though.