How to download Swift Playgrounds iPad app?

I see so many articles of people who have tried Swift Playgrounds app on iPad for development, that Apple announced in WWDC. But I am not able to find an ipa/download option from developer.apple.com. The public version is coming out in July, but I am not sure if a registered developer (with a developer account) can get access to it right now.

You need the iOS 10 Beta 1 (at least, if someone reads this in the future).

They have a "special" App Store in the betas, for the removable stock apps.

The confusion is probably that the app is called "Playgrounds", not including "Swift"! So in spotlight, type playgrounds or look for it on your home screen... (Not something I noticed right away; they should have told us!)