Does somebody know where will be held? Why have they taken so long to announce it? As far as I know, the host of next competition is always announced formally at the closing ceremony, but this wasn't the case at Beijing 2018.

Has this happened before? I am just asking out of curiosity :)

Update

There hasn't been an official announcement, but Bill Poucher said (kinda) that it will be held on Porto!

You can read his "announcement" here