With how Osaka had in the cards once of a previously thought of Forbidden Forest coaster, I'm surprised that we haven't gotten any substance of them maybe even reusing the name of that attraction.
I would think that if they would've announced it, it would've been at Opening Ceremony.
Honestly, with Supercharged and that we are still in the midst of booking season for the resort, the best course of action for the coaster (and T2Replacement) is to hold off on announcing them fully until Late August/Early September, as that would be a time that I would think make sense.