Whatever expansion is taking place it might be just a new attraction at JP and leave Jurassic World to a new park but we won’t know until later this year I guess. June 1st is construction time.
I would assume if this is happening, it'll be done via by two phases, with the first being JWRA next year, and the Trikes Replacement (along with other changes) for 2020.
If it's a coaster, I'd think they would have more reason for the project to be going through pre-work now than to just have it be a exposed steel/wooden Coaster.
Low-key guess, I wonder if they may be looking to rebuild the Discovery Center and surrounding area to try to act more like Jurassic Worlds Main Street.