Apparently the New Game Plus and High Difficulty modes of Yakuza: Like a Dragon will be paid: they will be part of the DLC Additional Challenge Expansion Pack.
For now, not much is known about the Additional Challenge Expansion Pack. Sega has promised that he will soon share new details, although it is not clear when. Of course, fans of Yakuza: Like a Dragon have not taken this move well, since usually such modes are included with the basic version of the games or are added post-launch with free patches, being only an increase in difficulty. Here instead they will be paid separately. Hopefully, at least there will be other new outline content.
Who knows if the western version of Yakuza: Like a Dragon, scheduled for 2020 on PS4, but already available in Japan, will have immediately integrated the Additional Challenge Expansion Pack. We hope so because even if it is extra features, they are the ones that greatly increase the longevity of a title, giving new stimuli to those who ended up replaying it.