Speaking with Joystiq, EA Canada Producer Sean Ramjagsingh confirmed the bonus mode would not make the transition to the Xbox One and PS4 versions of NHL 15, but would return on Xbox 360 and PlayStation 3.
NHL 15 (E3 2014)
"That's why we wanted to put it in, in the first place," he adds. "When we started to talk about who would maybe be buying our game, if they haven't moved on to the next-generation of consoles yet, they could be more casual hockey fans." The Anniversary Mode, Ramjagsingh says, speaks more to those casual players rather than it draws in hardcore fans from its nostalgia.
Since the game's release, EA has transitioned its teams to a new engine, specific to Xbox One and PS4. Though NHL 15 on new consoles will be powered by EA's new Ignite engine, the Xbox 360 and PS3 versions are not. Ramjagsingh did not cite the engine shift as a reason the Anniversary Mode was missing.