According to the post, the game's current state represents "the full content" planned for the game. The post also touches on content released post-release, which didn't make it into Battle Royale's launch for a variety of reasons.
"In the course of any game's development, there are always elements that never quite get finished or the team decides not to use in the final game," the post reads. "Some of these additional materials from the game's development phase have been recently released, but unfortunately these are very far from finished assets and were not included in the final game for a number of production and legal reasons."
PlayStation All-Stars Battle Royale will still receive a balance patch, third set of costumes for Dante, Raiden, Heihachi, Big Daddy and more, and monthly tournament leaderboard resets. You can read the full post here.
PlayStation All-Stars Battle Royale launched in November of last year.