There were,some pics leaked back in the spring of prototype Nikes with the air pods in the forefoot. I've heard they help with keeping your legs fresh during long runs.

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Strava

Here is the simple explanation in how they work.

During operation, when the ground-engaging surface 54 contacts the ground, a force is transmitted via the outsole 38 f to the medial cushioning arrangement 64 f and the lateral cushioning arrangement 66 f Namely, the force is transmitted to the second plate 198 through the second fluid-filled chamber 190 f and the fourth fluid-filled chamber 194 f, through the second plate 198 to the first fluid-filled chamber 188 f and the third fluid-filled chamber 192 f, and to the first plate 196 through the first fluid-filled chamber 188 f and the third fluid-filled chamber 192 f. The applied force causes the individual fluid-filled chambers 188 f, 190 f, 192 f, 194 f to compress, thereby absorbing the forces associated with the outsole 38 f contacting the ground. The force is transmitted to the midsole 36 f via the first plate 196 and the second plate 196, but is not experienced by the user as a point or localized load. Namely, and as described above, the first plate 196 and the second plate 198 are described as being formed from a rigid material. Accordingly, even though the medial cushioning arrangement 64 f and the lateral cushioning arrangement 66 f are located at discrete locations along the sole structure 14 f, the forces exerted on the first plate 196 and the second plate 198 by the medial cushioning arrangement 64 f and the lateral cushioning arrangement 66 f are dissipated over a length of the midsole 36 f such that neither applied force is applied at individual, discrete locations to a user's foot. Rather, the forces applied at the locations of the medial cushioning arrangement 64 f and the lateral cushioning arrangement 66 f are dissipated along a length of the first plate 196 and the second plate 198 due to the rigidity of the plates 196, 198 and, as such, point loads are not experienced by the user's foot when the foot is in contact with an insole 94 disposed within the interior void 26. Furthermore, by extending the second plate 196 between the first fluid-filled chamber 188 f and the second fluid-filled chamber 190 f of the medial cushioning arrangement 64 f and between the third fluid-filled chamber 192 f and the fourth fluid-filled chamber 194 f of the lateral cushioning arrangement 66 f, additional stability is provided to the cushioning arrangement 40 f by distributing the applied force between the cushioning arrangements 64 f, 66 f, the first segment 152 f, and the second segment 154 f.

Excellent, that really clarified things! I'm going to complicate it:
Boing
Boing
Boing
Boing

all the way to 1:59:40..

from the last sub-2 it was clear big K only needed a little bit - here he got better weather, more consistent pace car, and better shoes.. enough.
Still moving to watch..