Hours before Apple kicked off this year’s WWDC keynote a new Apple Developer Program License Agreement (accessibile only if you have a developer membership) was uploaded to Apple’s developer site with a timestamp of June 3rd 2019. Major changes were found when comparing it to the previous license agreement (October 10th 2018). The biggest change was the addition of as-yet-unannounced iPadOS to the list of operating systems that they support.
To be clear this is a marketing change and rename of the existing iOS for iPad, not a brand new OS from the ground up.