From Epic:

For the past five years, we’ve been building tools enabling Epic to bring our games directly to players. We built the Epic Games launcher on PC and Mac featuring Fortnite and Unreal Engine; we built a worldwide digital commerce ecosystem supporting dozens of payment methods; and we gained great economies of scale thanks to Fortnite’s growth.

As developers ourselves, we wanted two things: a store with fair economics, and a direct relationship with players. And we’ve heard that many of you want this too!

Soon we’ll launch the Epic Games store, and begin a long journey to advance the cause of all developers. The store will launch with a hand-curated set of games on PC and Mac, then it will open up more broadly to other games and to Android and other open platforms throughout 2019.