I think the E3 uses 16 x BM1680 Neuralprcessing Chips and one Asic or FPGA for the controlling.
But I hope it´s a multi-gpu-system with HDMI and a PCI-E-Plug, also usable for gaming and VR.

...could have more power compared to Vega-cards !
(12 x RX550) vs Vega:
Memory bandwith: Vega: 500.000 MB/s --- E3?: 1.380.000 (115.000x12)
Compute Units: Vega: 4096 --- E3?: 6144 (512x12)
TPU´s: Vega: 256 --- E3?: 384 (32x12)
ROP´s: Vega: 64 --- E3?: 192 (16x12)
and AMD hasnt licensed them or sold any chips have they? plus per dram requirements assuming 4GB per GPU they would be 18 GPUs...