I noticed that, too, but I wonder why they spent money to purchase new balls for the ball cannons if they were just going to get rid of it - unless they just had some balls in storage. I guess it wouldn't be a huge investment, but still...
I will not mourn GG, but I do wish they would take care of demo and construction in the off-season like they used to. It's a shorter season than it used to be, and it's cold - I get it - but they're not even trying to hide the modern equipment as in former years. Remember, for example, the big fence around the Riverblast, or even the fence around the pizza place, last year? Where is the mysterious fence now?