Earlier today, the official Dragon Ball website announced the Dragon Ball Z: Kakarot release date, for Japan at least. The announcement included some other information about the upcoming action-RPG, included the three pre-order bonuses that fans can look forward to if they decide to purchase the game early.
The Dragon Ball Z: Kakarot pre-order bonuses include the ability to play the training menu early, an exclusive side-quest, and status-up item. It's unclear exactly when the training menu will be available to those who pre-order Dragon Ball Z: Kakarot, but when it is released, it will let players fight against a virtual version of the new character Bonyu. The training room will be set in the Capsule Corporation, and it should give players the chance to learn Dragon Ball Z: Kakarot's combat ahead of release.
The pre-order exclusive side quest, meanwhile, is called A Dangerous Party of Friends. In this side quest, Goku returns from the planet Yardrat, and his friends decide to throw him a party to celebrate. As noted by Gematsu, this story was not seen in the original Dragon Ball Z manga or anime, so it's a completely new story made specifically for Dragon Ball Z: Kakarot.
And finally, the status-up item players can get by pre-ordering Dragon Ball Z: Kakarot is called Bento, which is the "happy ultra finest quality meat." Details are scarce, but eating this meat will let players "progress with an advantage in the early parts of the game."
Perhaps the most interesting of the three Dragon Ball Z: Kakarot pre-order bonuses is the "A Dangerous Party of Friends" side quest. The plot sounds like a standard filler episode of the anime, and while it's not actually from the anime, other side quests do seem to be based on filler episodes. For example, Dragon Ball Z: Kakarot has a mission where Goku learns to drive, which is a filler episode from the Cell Saga.
Of course, we should note that these Dragon Ball Z: Kakarot pre-order bonuses are so far only confirmed for the Japanese version of the game. It would be surprising if Bandai Namco went with different pre-order bonuses for the game's release in other regions.
Dragon Ball Z: Kakarot launches on January 16, 2020 for PC, PS4, and Xbox One in Japan, with no confirmed release date in other regions just yet.