They’re not mutually exclusive.
The Mutators / weekly challenges were already revealed a couple of weeks ago in a stream, and the pinting colloction was teased earlier that week in another stream but no date was given then beyond “soon”. There still hasn’t been any more hints about the actual anniversary celebration aside from lots of streaming, including hopefully an actual 24-hour stream, and a Q&A for which Hedge has been fishing some questions.
Some people are also mixing up the now-officially-announced weekly Mutators and the Deed update; those are separate and there’s no definite word yet about the Deeds.