Details are scarce
Apart from the 2012 HD remake, it's been a while since we've seen a new Tony Hawk's Pro Skater game. You'd have to go back to 2010's poorly received Shred to find a fresh title in the series. That appears set to change, as the news was spoken by the legend himself.
As reported by IGN, Tony Hawk mentioned several times on his SiriusXM radio show that "we're working on a new game." Despite the lack of details given by Hawk, Activision corroborated his claims and confirmed that it's involved in a new project for the Tony Hawk franchise, and that "more info is coming soon."
Since it sounds like not a whole lot about the new game is locked down yet, we thought we might respectfully suggest a few titles. Tony Hawk: Aren't You Getting Pretty Old for This Stuff? and Tony Hawk: You're an Adult, Start Acting Like It are two that we've been throwing around.