So far, there have been 10th and 20th editions. Will the trend continue?

Has to be explicitly released as an anniversary edition. A mere release in 2026 will not count.

Any region counts. For example, an edition only published and produced in the United States would suffice.

I have not read the book, but thought this would be an interesting question.

If this has not happened before 2027 Eastern Time, the market will resolve to no.

Mere announcement before 2027 will not count. It must be published before 2027.