Apparently they are planning some major changes to the track by 2015.
The start/finish line and pits will be moved to the Reta Oposta straight, so Curva Lago will become the first corner on the track and Curva Sol the last. I have mixed feelings about the idea, the cars at the start of the Brazilian GP entering the Senna S is one of the most iconic images in modern day Formula 1, but at the same time, moving the finish line to the back straight will allow more last-sector banzai overtaking opportunities, and the Senna S corner complex is still there (though no longer at the start). Likewise, they can finally fix the ridiculously long pitlane, which took up almost half the circuit.
They are also planning to upgrade the facilities and paddock, similar to the changes Silverstone underwent in 2010, though I don’t think anything about layout itself.