A new rumor reported by 9to5Mac says Apple has an external display in the works that includes an A13 chip with Neural Engine. The A13 chip would probably act as an eGPU, although that hasn’t been confirmed.
Having a CPU/GPU built into the external display could help Macs deliver high-resolution graphics without using all the resources of the computer’s internal chip. Apple could also combine the power of the display SoC with the Mac’s SoC to provide even more performance for running intensive graphic tasks.
Rumors that floated back in 2016 suggested Apple was working on a new version of the Thunderbolt display that included a graphics card, but no such display ever made an appearance.
9to5Mac says that the display with the A13 chip is likely a replacement for the Pro Display XDR it currently offers and that the release version of the display may use an even more powerful chip than the A13 that powered the iPhone 11.