Having used the BETA I cant see why it wont be released soon as seems stable and feature complete. Maybe they waiting for tvOS13 to be released - Hopefully.
m on one year contract with NowTV (Films + entertainment) and it is about to expire and now by next month we have the new (Disney+ and Apple+) so I'm thinking seriously to cancel Now Tv deal and move to Apple.
I still feel quite sure that the new app for tv (currently a long while in beta) will be released, but no idea how much longer the wait will be (nor why). Maybe the release of tvOS 13 on Tuesday will bring some news.
Well the final version of TVOS 13 has already gone to developers so they can make any last minute tweaks to apps so if the new app really is ready nothing would stop them launching on Tuesday. It would basically complete Apple TV everything else is a solid app on there now from BT Sport to Twitch.