Unless Dell plans on releasing this to the general public and converting most of their mobile line-up to something equivalent to this, otherwise, Dell is gas-lighting all of us.
Teasing us of what "Could Be", instead of what is.
A 120mm x 120mm "Nano-ITX" MoBo Standard would solve most issues.
We just need a "Updated MXM connector port on the side that faces "Side-Ways".
As for CPU, just have us screw in the CPU with a Torque limited Screw and mount the cooler assembly on top.
We know how to use Screw Drivers, even torque limited ones, it isn't hard.
Heck, even Dell's Compression Memory Module can co-exist by having it screwed in on a different end of the MoBo.