Fansites are abuzz with Indiana Jones 5 news. Empire summed it up in this article:
Empire: Movie News - Exclusive: Indy 5 Is A Go!
And here's the BBC video where Shia Labeouf mentions it while promoting Transformers 2:The hat is officially out of the bag. On Monday Shia Labeouf let slip that a follow up to Indiana Jones And The Kingdom of the Crystal Skull was on the cards and now Frank Marshall has pretty much confirmed it, suggesting that Indy V could be approaching the pencil-chewing script development stage.
BBC NEWS | Entertainment | Shia LaBeouf talks Transformers and Indy 5