It's looking like the banner update a few days was incorrect outside of the character reveals, but there is still always a chance we will see Youtube releases on the official pony channel due to how many hints they've dropped that it will be airing there.
A few groups in the fandom already plan on stream parties for Canada's 21st release on Treehouse, so for now we are considering that the start, but keeping an eye out for early releases that might happen elsewhere. Considering how leaky and unreliable everything has been for the past few years, it wouldn't surprise me if we randomly got a complete dump of the entire season on some obscure local cables streaming service out of Antarctica or something.
Hopefully it's good! The teasers were fun, so maybe this will deliver after all. Keep an eye out here for any updates!
