Right now, none really -- it's a hardware enablement testbed, and really only shows a handful of information, such as Caps/Num/Scroll and what layer you're using.

With QMK we get a lot of requests for "how do I display this", "how do I show that", so it's more a case of making sure it supports most of those scenarios.

Sadly with the silicon shortages, not a lot of people are getting the chance to build them... I'm sure we'd see some interesting usages if/when this display stuff becomes a bit more mainstream.