There's little technical detail that wasn't in the ipad review's benchmarks[1] and previous speculation on using apple chips in desktop machines[2].
Everything new they gave no details on, and the only in-depth answers were hard hitting questions like "you could have made a slow chip, why did you decide to make a fast one instead?" and "why is apple so good at teamwork?" (maybe not the questions that were asked, but they were the questions that were answered :)
[1] https://arstechnica.com/gadgets/2018/11/2018-ipad-pro-review...
[2] https://arstechnica.com/gadgets/2018/04/apple-is-exploring-m...