Stage 3
Like the Metal Spin, this obstacle is the same as in previous seasons. Competitors hang from two rings and slide along bars with bends and dips. The only difference is that now the Arm Rings goes straight into the next obstacle, with no opportunity to rest. 
The Arm Bike was a feature of early seasons, but hasn't been seen on Ninja Warrior in years. Competitors cross the water using a pedaling mechanism with their arms. This obstacle seems designed to tire the competitors out before the grueling obstacles ahead. The competitors tend to make pedaling motions with their dangling legs, which I confess looks a bit comical to me.
New obstacle. Competitors cross the water by hanging from a series of four curtains. This is similar to the Curtain Cling of previous seasons. 
Modified obstacle. Competitors cross the water on a 1-inch ledge, hanging by their fingertips. 
This already-difficult obstacle is much tougher now. The middle section is on an incline, and the gap between the second and third section is so wide that all three Stage 3 competitors went out at that place. Shunsuke Nagasaki and Kenji Takahashi fell; Makoto Nagano successfully reached across, but accidently rested one hand on the top of the structure and was disqualified.
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?
No one completed stage 2 this time, so we didn't get to see any of stage 3. They did show a quick shot of one new obstacle in the episode intro. It looks like a staircase that goes up and then down. If this were Women of Ninja Warrior (Kunoichi) I'd guess the steps wobble back and forth, requiring competitors to balance as they climb. For men's Ninja Warrior, I don't know ... maybe they have to hang from the steps? 
