Whoops, here to over analyze again!
So, the blanked out space in HBO's Nov. 10th schedule is now an episode of Axios. The Saturday Nov. 9th schedule has a blanked-out space at 7:00pm, but a movie comes on at 7:45, and this special is at least 50-something minutes. So something might change there, but I feel like it's safe to say this is when the special is airing.
Also of note - blanked out listing in their Saturday Nov. 16th schedule at 9am, which is when new episodes usually debut. So, that's probably when Season 50 begins.
But whatever, we'll get official word within the next couple of weeks when the press kit drops.