United Front Games has said that there is "lots of exciting DLC" being worked on currently, and while details can't be revealed, the studio has been keeping track of fan feedback for the content.
Copyright: Square Enix"We recently had a poll on the Sleeping Dogs website to help decide one of our future DLC packs. The community voted and we listened - that's the most satisfying way to make games," producer Dan Sochan told Digital Spy.
When it came to planning post-release content, Sochan said that the studio's philosophy was to offer experiences different to those seen in the main campaign.
"Whether it's outfits from ancient Chinese lore, racing in boats or beating up on hopping Chinese vampires - it needed to feel fresh to the player, as well as be exciting for us to work on," he said.
"We didn't start on DLC until the main version of the game had shipped so that we could get all of the polish in we could - which is critical when launching a new IP.
"So once Sleeping Dogs was out the door, we were able to brainstorm and think outside the main story to create some unique DLC ideas; gameplay situations that the player couldn't experience in the main campaign."
> Sleeping Dogs 'Nightmare in North Point' DLC inspired by comedy horror cinema
Announced earlier this month, the 'Nightmare in North Point' DLC sees Wei Shen battle an army of the undead led by a former gang member going by the name Smiley Cat.
The expansion will have players fighting zombies and vampires throughout Hong Kong while searching for lost Chinese magic.
It is the latest expansion to be announced for Sleeping Dogs, following October's 'Street Racer Pack', 'Tactical Soldier Pack', 'SWAT Pack' and 'Community Gift Pack'.
Released in August for Xbox 360, PS3 and PC, Sleeping Dogs was a mainstay in the UK all-format charts for a number of weeks.
The Sleeping Dogs 'Nightmare in North Point' DLC will be available from today (October 31) for Xbox 360, PS3 and PC.
> Read Digital Spy's Sleeping Dogs review
Watch a video for Sleeping Dogs DLC 'Nightmare in North Point' below: