A new video has been posted by Disney and it is a simulated look at "Arendelle: World of Frozen" including, at the 47 second mark, Oaken's Sliding Sleighs "in action". It's a quick simulation, but it gives you a bit of an idea of it's run. And this is an overhead shot of (mainly) the Castle, but you can see Arendelle in back. And on the left of it, there is still space to put something else! Between Arendelle and Toy Story land. Perfect!
Thanks to Alex2077 for this great shot.
And in the "LOOK WHAT I FOUND" Dept. - I took another look at the video, and two spots in it, caught my curious attention. At 00:27 there is a "door" with Frozen-like design around it. Then at 01:17 one sees the door frame lit up, bottom right corner of the screen. Could this be the (official) entry for the Slidin' Sleighs' Coaster attraction? And the building in front (to it's left) is obviously Oaken's Shop, which will be the exit way of the attraction (the Gift Shop). Looks like it, to me.