I'm wondering if they'd be able implement special track pieces.
For example:
-Turntables (like on several MACK coasters)
-Track pieces that travel sidewards (Powder Keg), and maybe even give us the possiblity to build these on slopes.
-Similar to the above:
http://rcdb.com/2493.htm?p=9519
-Tilting trackpieces:
http://rcdb.com/1357.htm
-And also direction and track switches like those found on Expedition Everrest.
I bet at least some of those could be implemented by modifying the transit tracks that were shown in the video. However I doubt we'll see it in the final game, I bet it would be too much work to make something like that.
But just imagine what amazing things you could do with elements like that.