They better we already know Sony got a trademark for Jak and Daxter the Lost Frontier.
Also wikipedia has a few interesting points:
"Future of the Jak and Daxter series
Initially, Naughty Dog hadn't had any future Jak games in the series, with only hints and comments providing clues to their decision. Co-President Evan Wells stated that the new technology in their Uncharted: Drake's Fortune engine may be used for a new Jak and Daxter trilogy, as well as saying that "there is a lot of interest around the office in going back to that franchise [Jak and Daxter] and seeing what we could do with it using the Uncharted engine." In mid 2006, more concrete details emerged when a trademark for an, apparently, possible future Jak and Daxter game was registered at the U.S. Patent and Trademark Office called Jak and Daxter: The Lost Frontier.[3][4] Even later, several prototype game cinematics were also leaked onto the Internet featuring old and new game characters in unfamiliar situations (Jak has short-cut hair and, along with Daxter, is interacting with new allies and battling new foes).[5] However, Naughty Dog refused to comment on both.
Naughty Dog did not show up at the E3 2008 convention or TGS 2008, leaving many uncertain of what they were doing. But in a recent IGN interview with Naughty Dog's Richard Lemarchand,[6] he explains that "You won't have to wait too long for [the big revelation]." and that "We are working hard on something, and we haven't just been resting on our laurels". In December 2008 it was revealed that Naughty Dog was working on Uncharted 2: Among Thieves,[7] leaving the future of the Jak series uncertain."
http://en.wikipedia.org/wiki/Jak_and_daxter#Future_of_the_Jak_and_Daxter_series











