Construction walls up at the Tomorrowland Speedway - perhaps Fantasyland expansion related?

A couple of weeks ago at the Tomorrowland Speedway, some construction walls sprung up around the section of track closest to Mickey's Toontown Fair. It could of course be for something mundane, such as pipework or drainage, but it wouldn't be the first time that the track has been re-routed, and that area of land is expected to be very close to the new Dumbo expansion in the all new Fantasyland. So is Disney creating a little extra room for the new Fantasyland?