After rumours of something called Triad Wars were flying around, United Front Games took to their website to confirm it is indeed in development and related to Sleeping Dogs.
"Hi everyone! We've been a bit tight-lipped about our current projects over here at UFG, but we're finally able to give you a little something.
So, we're making a new game! We can't say a lot about it right now, but you might have read about a trademark registration for something called Triad Wars? Well, we're super-excited that it's another game based in the Sleeping Dogs universe, it's something we've wanted to do for ages, and we're very happy to be working with Square Enix again... but that's all we can give you for the time being - we'll have more information about what the game's going to be in 2014.
As always, we love to hear your thoughts and appreciate your shared interest in the games we make - although to reiterate, we really can't share any more details until 2014 (despite your best efforts to get them, you sneaky people!)
Love,
UFG"
So what could it be? Doesn't quite sound like a straight up sequel. Something social and on mobile? Some kind of multiplayer spin-off? We'll know more in 2014.