The phrase "one's official announcement" refers to a statement or declaration made by a person that is authorized or recognized as being true and legitimate. Full definition
Normally it starts with some sort of official announcement of a new game in development. (oceanicgamer.com)
We'll put that one in our hope chest and keep waiting for official announcements. (theverge.com)
We're sure some kind of official announcement on the casting will follow soon enough, but it's certainly made us take notice of the project. (indiewire.com)