During a panel at the New York City Comic-Con last weekend (via Polygon), the game's producer Michiteru Okabe has revealed a bonus for players who pre-order Resident Evil: Revelations 2 for PlayStation 3 or PlayStation 4.
This bonus consists in a a free bonus mode, called Raid Mode Throwback. It is a variation of the Raid Mode introduced in the first game, which asks one or two players to fight their way through maps from the single player campaign populated with different enemies. Raid Mode Throwback will work the same, only with stages from previous Resident Evil games.
You can pre-order it on PS4 on October 14, while it should be available for pre-order on PS3 later this month. Resident Evil: Reveleations 2 will land on Xbox 360, Xbox One, PS3, PS4, and PC in 2015.