Yakuza's official Twitter announces that they will postpone this game until April, exactly on April 17, 2018. This delay makes Yakuza 6: The Song of Life will be a little late from the planned release date, which is March 20, 2018. Sega mention that the delay because they will prepare other things (including finishing, red) before the game is ready to be released.
Some other things that are meant is a demo release that you can enjoy on 27 February. You who play the demo, will be able to continue it when the game is released a few weeks later. Sega promised to provide more information in a few weeks.