"The store’s very first app: Delta [a Game Boy emulator].... The really interesting part is that none of it requires you to jailbreak your iPhone...."

Awesome! Great motivation to build an alt. app. store too.

edit:

Works like Cydia Impactor: “AltStore basically lets you install apps outside the App Store by tricking the phone into thinking you developed the app yourself, like you programmed it and you installed it and you’re testing out your device,”