Apple today released the first betas of iOS 17.1 and iPadOS 17.1 to developers for testing purposes, with the beta coming one day after the launch of the iOS 17 operating system. Registered developers are able to opt into the betas by opening up the Settings app, going to the Software Update section, tapping on the "Beta Updates" option, and toggling on the iOS 17 or iPadOS 17 Developer Beta. An Apple ID associated with a developer account is required to download and install the beta.
Still no side loading then?
I don’t think you will see that until the EU deadline nears next spring. It’s rather orthogonal to standard software updates
They will delay it and fight it as much as possible, I thought that was pretty clear