The as yet unannounced title is being teased on the developer's personal site, with the message scrawled in French on a chalk board: "The name of the next game is on the back of the slate."
When clicked on, another image of the chalk board is shown with smudged writing, a note below it says: "Sorry, it's not LBA3!".
Raynal is known for his work on Alone in the Dark and Little Big Adventure but most recently worked on Soul Bubbles for the Nintendo DS.
Via NeoGaf.