I know the game isn't out yet for the PS4, but when it releases this February, you will be able to import your saved games from the PS3 and Vita versions of the game and vice versa. That's a great bonus for those of you that bought it on the PS3 or Vita this past November.
Source: Gaming UnionWhat's new this time around is the additional platforms. It's now been confirmed that if you have the PS3 version of Dynasty Warriors 8, you can import the save data to both the PS4 and PS Vita versions (Dynasty Warriors 8: Xtreme Legends Complete Edition). It's also been revealed that this can work in reverse.
This will come as a welcome surprise to fans of the franchise, who were concerned about the release of the PS4 and PS Vita versions, due to questions about data importing. As you can also share across the different platforms, it also means that if you have a PS3/PS4 and PS Vita, you can pick-up right where you left off when you are on the move.