The real noise question depends on where they put it. The old DF site is a perfect coaster spot, but I know KM really hated having DF there. They could move the grazing pasture of the Clysdales and sheep to the old DF site and build a coaster in the pasture on the other side of the train station in Festa. I know Tempesto just went there, but it would give that part of the park even more love after years of neglect.
There's always a chance of something being removed too. A huge Longshot but possibility would be removing Europe in Air, using the building as a queue, and putting a coaster in the space between Ireland and england. I'd hate to see trees go in that part of the park, but Ireland could use a new thrill ride and none of the simulators have been enjoyable to me since Questor. That would be my favorite spot for an attraction from an objective view, least favorite from a clearing trees view.
I'd love to see a coaster on the old DF that reuses the station and train barn. I don't think that will happen, but I'd love it. I do know the park has specific "protected" sites here and there that they won't remove trees, or at least they used to.
Also, a drop doesn't necessarily mean coaster. With the poor performance of rapids lately, a new water ride would also be a good addition.
They could also be trolling like all those "call RMC" memos Tony puts out on his twitter feed for CP.