The gold antenna array pops out, and sees all.

With the fan released, it looks to be powered by a Nidec brushless DC motor, model number AG720K01.

The motor controller IC is an Allegro Microsystems A5940LPT Three Phase Sensorless Sinusoidal Fan Driver.

We noticed a few cavities around the edges of the impeller filled with some sort of epoxy (on both sides). We suspect it's for fine-tuned balancing, to keep the fan running smooth and quiet.