https://www.pcgamer.com/planetside-arena-delayed-again-pre-orders-refunded/

PlanetSide Arena adapts the MMO shooter into a match-based format, with a battle royale mode as well as 250v250 team battles. It was supposed to launch on January 29, but just a few days before that date, Daybreak Game Company announced that it was delayed until March. After a closed beta, Daybreak has again decided to postpone Arena's launch, this time until the summer, when it'll also release on PS4.

The announcement post doesn't offer a firm reason for the postponement, only saying that "delivering the most polished version of PlanetSide Arena ... outweighs any other consideration."