Tony Scott is one of the most consistently busy directors in Hollywood. He's always working. And while the quality can sometimes be questionable, he's more than capable of banging out a cracker (Man of Fire), even if his execution is somewhat predictable (Domino, The Taking of Pelham 123)
Next for Ridley's little bro could be the thriller, Narco Sub. According to the fine folks at Collider, the plot will have "something to do with submersible crafts used by South American drug cartels to smuggle product into the states." Scott is also attached to direct Hell's Angels, and a remake of the classic western, The Wild Bunch. The script for 'Narco' was written by hugely in demand scripter, David Guggenheim, who just penned the ace looking Ryan Reynolds/Denzel Washington starrer, Safe House. Trust me, it's better looking than you realise.
It's not clear which movie will move first for Scott, but he's producing through his production company co-owned with his brother, Ridley, Scott Free - so a greenlight probably depends on star interest.