On the official website of the remastered collection, Konami stated:
Regarding the planned release of Suikoden I & II HD Remaster: Gate Rune and Dunan Unification Wars, we have reached the conclusion that despite the very best efforts of our dedicated development staff to release the Remasters in 2023, additional time is needed to ensure the quality performance and gameplay experience our users deserve.
The entire Suikoden team is renewing our efforts to bring Suikoden I & II HD Remaster to release as soon as is possible.
We will share further release information as soon as it becomes available, on our official social media accounts and official homepage.
We appreciate your understanding and sincerely hope you will continue to lend Suikoden your support.
Konami has not revealed a new release date, but it is highly likely to be delayed to 2024. The developers need more time to work on the game so the delay would be further to next year.
Suikoden I & II HD Remaster: Gate Rune and Dunan Unification will be available on PC, PS4, Xbox One, and Nintendo Switch.