I just saw that (on TPR) and commented too. A re-theme of county fair was my first cynical thought, but I think they still have their minds set on expansion.
I think this will be their "answer" to Fireman's Landing. Maybe they'll squeeze a new indoor play area as well. I don't think the train loop is a practical area to expand into yet, but there is room north of the entrance if they get creative.
I just hope they go with farming. Music is already a major theme of the park, roadside attractions seems wonky, and snow is just lame.