Using a diagram made a few months ago by PhantaFriends.de user M!cha I've attempted to create an overview of the current state of the Rookburgh construction site based on reports on PhantaFriends.de. (The things you do during a long lunch break at work....)
Red - This is where all the supports and track have been erected already. Now theming structures + buildings or/and sound proof wall facades are being erected.
The steampunk towers from the teaser sign art.
Grey - I've painted in where there is a large concrete floor plate. Presumably the station will be on part of this. Whether it is on the stretch alongside the Maus au Chocolat building or the longer bit parallel to the earth ramp is unknown. Given that the sidesays loading track for the station and the brake run, and the launch track are sitting outside at Vlodrop awaiting delivery I imagine the station will soon be going vertical. Either way as the station is at the lowest part of the site it will be an underground station like Black Mamba's.
EDIT: As Mrrc posted above it seems the launch track is on it's way to Phantasialand.
Green - Coaster footers are being put in this area now. As of last Saturday when this was reported on PhantaFriends.de a number of footers were already finished.
I imagine we'll supports going up here soon depending on what theming elements will be there.
Blue - Nothing has been happening here yet as far as we know - the Race for Atlantis entrance sign is still up over the door! However it was discussed on PhantaFriends.de recently what will become of the old Race for Atlantis queueline in part of the Maus au Chocolat building. Anyone who rode RfA post 2010 might remember you entered a cattlepen inside a plain concrete room before entering the dome. Without a doubt Rookburgh was in early stages of planning when Maus au Chocolat opened so they probably already planned it's repurposing. Anything is possible really - part of the queueline for F.L.Y. or one of the other attractions in the area, a shop/cafe/restaurant or a backstage area.