There's not much else to go on, really. It's going to involve skateboarding, and Pocket Gamer mentions that the mogul seems pretty "enthusiastic about the project," but that's pretty much it. Although it's a little odd that he thinks there hasn't been a Tony Hawk game on mobile yet, given that Tony Hawk's Pro Skater 2 has been available since 2010 (and hasn't been updated in years). Maybe what he really means is that it'll be the first game in the series that was developed specifically for mobile?
Regardless, a new game is coming and we'll be keeping an eye out for more details.