According to a recent job listing, LucasArts is developing an “Open World RPG”.
While my money is on a new Star Wars game, it could easily be a new IP or even an Indiana Jones game (I doubt it). The job listing states that LucasArts is seeking a gameplay engineer to work on an open-world RPG, but sadly, no other information is given.
Platforms aren't stated, but the description says that “Console development experience [is] required (At least one title),”, so it is likely that the game will be a multiplatform release.
We'll be sure to keep an eye on this and will hopefully find out more details sooner than later.