The Rebecca T-shirt features the “0” logo along with a face of a character. The Costume Pack 1 comes with Rebecca’s cheerleader outfit, which originated from Resident Evil: Deadly Silence, as well as the Wolf Force costume for Billy. In order to access the alternate looks, you have to use the personal section from the status screen. Both packs are digital bonuses for preordering the game.
Resident Evil 0 HD is also being released physically via the Resident Evil Origins Collection. If you are interested, you can preorder the Xbox One version of the compilation (which comes bundled with Resident Evil HD) with this link on Amazon.
Resident Evil 0, as well as Resident Evil Origins Collection, will be released on the 19th of January in North American and other regions. The HD version of the prequel comes with audio and visual improvements along with a new Wesker mode where you can play as the villain.