Universal is not taking any chances in giving out at a specific date for a new attractions opening, since they got burned pretty badly with RRR. Probably in 2 or 3 months or so we might have a better idea but I wouldnt hold my breath for an exact date announcement anytime soon. Its going to come down to a couple of things
How fast is the construction progressing (weather or delivery delays etc)
and what Universals definition of summer is.
When we were over there today, almost all of the major exterior work is done and they are working indoors now. On the assumption that the ride tech is proven and coming from the other parks, there really shouldnt be any hold ups on that side.