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Though it isn't enough to confirm a third film, there have been indications to a possible sequel, through a bunch of news bits over the past couple of years:
In 2010, Reeves indicated that Matheson and Solomon were working on a script for a third film. Winter has stated that the role of Rufus (previously played by the late George Carlin) would not be recast. In April 2011, Reeves stated that a third film was close to happening. On April 24, 2011, Winter tweeted that the script for the third installment had been finished
So... yeah. The scripts finished, it's just a case of the project being greenlit and such.