Unknown
Since no competitors made it past the Cliff Hanger, we didn't get to see the remaining obstacles in Stage 3. The icons show the Jumping Bars and the Bridge of Destiny, and then two icons I didn't recognize. Have they gotten rid of the dreaded Pipe Slider?
The unknown icons are the Ascending Climb and the Ring Slider.
The Ascending Climb is a wall with rock climbing artifacts on it. You must climb it while hanging.
The Ring Slider is... well... the Pipe Slider with a ring, not a pipe. :P