Rumor, or not, it seems something is going on behind the curtain since it's so close and yet there hasn't been any sort of reports of soft openings happening. It is a complex ride and unique compared the other rides, with the length of the backwards track, as well as the drop being part of the equation.
Whether it opens, or not on the expected time, we'll see. However, I have a feeling once it's officially open, whether it's soft, or the grand opening, there is going to be a lot of delays and issues I believe more than usual due to the lack of duration of time of trial runs (with guests involved).