You have somewhere like a date near the new update?
Viewing post in Tails' Workshop [1.1.1] comments
I don't have any exact dates but it takes a few months from beginning to end of update development. Currently I'm plotting out how the next update will go since it's a little different to the last one.
But if I were to ballpark it, next major update might be released around January to February of next year. With smaller updates and tweaks between now and then.