Initially revealed at the E3 2010 trade show in Los Angeles, Resident Evil: Revelations was directed by Resident Evil 5 co-designer Koushi Nakanishi and produced by Masachika Kawata and Takayuki Hama.
Resident Evil Revelation's storyline seems to have changed since the original trailer. Jill and Chris are not against each other, and the agent believed by fans to have been HUNK is revealed as just a Veltro Soldier.
Tsukasa Takenaka, who provided the story background and in-game files for Resident Evil 5, joined the team as assistant producer. According to Kawata, the title would see a return to the classic exploration and puzzle-solving of earlier series installments, with more emphasis put on horror.
It was revealed that Dai Sato, who worked on Cowboy Bebop and Samurai Champloo was responsible for the plot in Revelations. He was also responsible for the creation of the two new characters, Keith and Quint.
The HD / Unveiled Edition of the game released in 2013 featured several changes:
The First Person Shooter (FPS) Aiming option/mode was removed.
The laser was removed, a crosshair was added in place.
The new version makes use of the Resident Evil.net service, providing players with weapons and other items.
It includes new costumes for Chris and Jill and new playable characters in Raid Mode, this includes; Rachel Foley, HUNK and extra DLC Characters like Ooze Rachel and Lady Hunk, with a variety of new DLC Weapons.
There is a new Infernal Difficulty that replaces the Hell Difficulty from the 3DS original. In addition to being relatively harder, items are found in different places. (similar to older RE games' "Arrange Modes").