One of the subtle effects (I think) appears that the gripping motion closes with a variable force. It appeared as if the closing motion commenced with a quick snap shut, but slowed to a less forceful, yet sufficiently firm grip on the target, so as to ensure handling without crushing. Might have been neat to see them pick up an egg, for example.
I was also surprised to find out how many different innovative projects Festo has done in biomimicry, many of them robotic, such as the AquaPenguin and Aqua Jelly in our Nautical Robot slideshow:
In this case, the idea of the grippers is better energy-efficiency, with high gripping force-to-weight ratios, so there's less wasted motion.
Festo seems to be doing a lot of great things with biomickry and design. This is a pretty interesting interpretation of bringing animal-like movements to a gripping type of robot. Is the idea that the robot machinery gains dexterity because of this motion?
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