Relax; take a look at what Rob said. The pylons will be cut down to size later on. To establish a suitably stable foundation, the pylons have to be driven deep into the ground; however, no one knows for sure just how deep that is. As a result, the pylons are made to be longer than what is actually needed for the final structure. Look at the pics; notice how the pylons are all slightly different heights from one another? Thats because each one went a different distance into the ground. Some went in deeper to hit solid rock, others went in a bit shallower. Point is, the actual pier will not be that high; it will be more or less the same height as the promenade.
For a good baseline, I'm willing to bet the pylons will end up about as high as the orange markings on the nearest ones.