DualShock Nexus: Naughty Dog has a huge patch in store for Uncharted 3. So huge that all of the details can't be covered in just one blog post. 1.13 will include "an exciting new system", new DLC and gameplay fixes. You can expect the update to arrive some time around mid August.
The next update from Naughty Dog will be July 30th at the latest.
Two new legacy levels are coming.