Since it keeps coming up, the chances of any sort of berm and/or trees in the construction area to block the views from Storybook Circus are slim to none.
Above is the link to the plan submitted to the South Florida Water Management District. Sheets 3C-201 and 3C-202 show the area around the restroom building and north of the showbuilding. The bulk of this area is shaded grey, labeled "Proposed Asphalt Pavement".
Now yes, these drawings are dated 05/14/18 and Disney loves to change things. It is possible that Disney has modified the site plan in ways that no longer correlate to these drawings and also are not materially significant enough to require new drawings and further modifications to the permit. Building less asphalt area in favor of more landscape area is actually just such a change. The problem with this hypothetical that Disney could decide not to build the area as asphalt is Florida Fire Prevention Code NFPA 1 18.2.3 which requires fire department access to buildings. Disney can't decide to build a berm or even just plant a bunch of trees because then there would be no required access to the new restroom building. There are also no available alternatives to coming from the East along the north of the gravity box as coming from the south is blocked by the coaster launch. The railroad tunnel and all of the walkways prevent access from the west. Access from the north would require running parallel to the train tracks, something that would required significant modification to the retention pond and likely changes to the drawings. So no, there is not some big plot in the construction area that could become a lush forest to hide the showbuilding, it will instead almost certainly be beautiful asphalt for people to look at from the coaster, the walkways and the Walt Disney World Railroad.