"Our team is a very highly experienced team, the average experience among most people is about 15 years, and all of them come from original development. It's not like we're a bunch of developers that got trained up on making remasters and remakes. We have that original game development mindset in our hearts, and that's what we're now ready, finally ready with the support of Sony to push forward and show what we can do, and show what PlayStation can do."
Thrush also said they are not yet ready to reveal their new title, or exactly what "original content" means. It could be a new IP, a sequel to an existing franchise, or an enhanced remake that combines their experience at remaking games with some original content of their own.
Source (PlayStation Blog announcement)
Source (IGN interview)