As of question writing, Hong Kong is officially a Special administrative region of China (along with Macau).

The Hong Kong Basic Law (the de facto constitution of HK) says in Chapter II, article 12:

The Hong Kong Special Administrative Region shall be a local administrative region of the People's Republic of China, which shall enjoy a high degree of autonomy and come directly under the Central People's Government.

Question: When will Hong Kong stop being a Special Administrative Region of China?

Resolution details:

This question resolves upon publication of an official document by the Hong Kong authorities (or Chinese government if the former don't exist anymore) that declares another status for Hong Kong.
This question does not resolve from the Special Administrative Region status being merely renamed or slightly tweaked, as judged by a Metaculus admin on the basis of credible media reports.
In that last case, the Metaculus admins can choose to resolve ambiguous if the situation is judged to have become too unclear/contentious/intractable.
If a relevant declaration is made by some HK authority, but contested by another, a Metaculus admin can choose to delay question resolution until dominance or consensus is reached.