Also let me explain exactly what and why these spikes are the way they are.
The reason the plate is now embedded in foam is really simple - Nike wanted to increase the pitch angle of the plate to allow for more midfoot to toe "drop" - the same principal that has worked so well on the 4%, NXT% and Alphafly shoes. The science is correct and it works.
When you have a large space to work with (think the thickness of a midsole that can be as thick as 40mm at size 9) this is kind of easy. When you don't have that space available - like on a spike, it's a bit more challenging. To visualize what they have done, think about keeping the upper orientation fixed and think about rotating the plate forwards or downwards towards the toe. Now think of the "gaps"/space that are made - you have to fill them in with something - Zoom X.
The problem doing this with a spike though? More cushioning. First thing to realize is that zoom X or any foam for that matter isn't some magic material that is capable of generating propulsion for a human of any weight - even a new born baby. In the road racing product the foam allows the necessary compression (10mm of drop) and there is of course benefit created with muscular vibration reduction etc that we know reduces fatigue, especially over extended duration (like a Marathon) - which is why the biggest gains are seen over a Marathon in particular from 35km onwards (why Rhonex Kipruto ran 26.24 in adidas flats with no plate or zoom X).
But in a track spike - max duration 10km running on a cushioned, elastically rebounding surface already? Hmmm, not so sure about that. So you can probably list the benefits as an increase in plate pitch and the accompanying midfoot>toe drop, and muscular "protection" benefit (very dubious this happens over such such distances on a track anyway) and they are offset by weight and reduced force transfer (due to the extra cushioning).
So what is it? It's mental. Anything an athlete believes makes them better is a huge help - maybe even more of a help than anything actual physical on shoe. I actually think the dragonflys will be an excellent training spike when athletes are out on the track for duration potentially of over an hour - but a race of up to 10000m?
The basis of the science Nike is usinng applies so much better to road surfaces than the track, that's the reality here. So I agree with cheeseballs, and the above is why.