If you've purchased the Showcase Season Pass in WWE 2K15, you should have access to the Accelerator, which allows you unlock every WWE Superstar, Legend, and Diva (including alternate attire), as well as all the arenas and championships in WWE 2K15.
NOTE: The Accelerator will not be available in the game until the PlayStation Store is updated later on today.
To unlock this content, please follow the instructions below.
- On the main menu, select "Options."
- At the Options screen, select "Unlockables."
- At the bottom of this screen, you should see a text prompt to unlock all content. Follow that prompt and this should unlock all the game's content.