As an early developer (Day 1 of App Store launch in 2008 - iRetroPhone) there is some excitement of being the first on a new platform. Back in 2008, there was very little documentation on UIKit but it was fun to develop. The difference I see this time is we had access to the iPhone(released 2007) and this time[1] it looks like you need to either ask Apple to test the app for you, or go to one of the labs (not in NYC strangely) or be one of the lucky ones to be selected for developer kit.
One more thing I found strange was the current Xcode 15 beta does not even come with Vision OS SDK (coming later this month) and we cant even play with the WWDC session videos in the simulator