The 4th generation Apple TV includes a App Store, which will allow users to access many apps and features that were not previously available on the older Apple TV. Popular media streaming apps Plex and VLC, for example, are both making its way to the Apple TV, with tvOS versions already in the works.
VLC is a cross-platform media player designed to support multiple audio and video file formats and act as a streaming server. VLC is available on streaming devices that compete with the Apple TV, such as the Amazon Fire TV, but right now, it's been limited to Macs and iOS devices.
Under the same fashion, popular media organization and streaming app Plex is coming to the Apple TV. A tvOS version of Plex is in development and by announcing this, Apple might have just won itself a few more fans. Currently, Plex works with the Chromecast and the Fire TV, and it is a popular choice with jailbroken Apple TVs, but it is not available to Apple TV users in any official capacity.
There is no word regarding when the team will develop the app and ship it with Apple TV. Till then you can take comfort in knowing and one day you won't have to jailbreak your Apple TV or install a sneaky workaround to stream your digital movies across your home with Plex.