Unfortunately, the more that I think about it, the more that I realize that 1) this never explicitly states it to be a formal announcement, and 2) we might have jumped the shark on this one. Last year's Rocket Racer campaign was far more spruced up than what currently appears to be a much larger attraction. Besides, think through the logic; why would the park not tease their major investment, which will be depended on to attract visitors and turn a profit? The obvious answer would of course be a complete ball drop, but if so then why spoil your own surprise in an instagram comment of all places? Not saying that it won't happen tomorrow, but I don't think that its a complete given like many are assuming.
If I remember correctly, that "backlash" came from roller coaster enthusiasts online, and not the sensible ones. Why? Because they announced a waterslide and not a roller coaster. Unless of course there was some other drama that you might know more about than myself.