So they are going to replace LC and DC with Forbidden Forest? And they are putting in a B&M Hyper, a high speed ride that would typically have an out and back layout, that doesn't fit that plot at all. To make it fit, it would pretty much have to run the perimeter of the current DC and LC areas that border backstage. And even then, it would be small for a B&M Hyper. That leaves most of LC and the DC plot left. Both of which, you could just about put another DA with Gringott's on. Not to mention it would mean the Forest would be split by the Hogsmede station and pathways. You can have the coaster cross it, but everything else would have to go around. This almost sounds like one of those false rumors they float to flush out leaks.