I don't think anyone else mentioned it, but just to add weight to the "something is happening even if we do not know what" argument, there was a surveyor doing some very detailed drawings and measurements of The Capitol a couple of weeks ago. He was stationed in front of C&C with the surveyor's level and detailed plans for the building and the pavement in front of it.

There was no indication who this was being done for but it would have been a substantial investment for someone!