It was pretty significant refurb of the track. A lot of the track in a lot of places was torn up and replaced completely. The trains were also all removed and worked on. Mostly it was just a paint and repair job though so don't expect anything majorly different about the ride.
We were up there on Sat and the trains were up and running. I know from going there about a week prior, that the train station at Main Street was blocked off with construction boards.