I hope we have it today. Yesterday I went on the xbox support site and I chatted with an microsoft employes and I asked them if they know when the update will lauch and they told me that the Terraria devd had sent an update but they don’t know if microsoft has started working on it.Microsoft has shut down for the rest of the year for the Holidays. I would say that means if the update doesn't roll out today it's probably going to be mid January 2018.
I honestly feel like this whole thing could have been avoided by telling Xbox owner "hey don't suspend your game" "make sure to exit to main menu until we fix this"
Honestly Xbox owners are probably looking at a week or so into January before it passes certification, another week for pipeworks to address any bugs? I'm guessing so that would be around mid January.
Of course all that could change if it dropped today for everyone but I wouldn't bet on it. Although Tuesdays and Thursdays are typically update days for Xbox.