The plan is to release new locations, assignments and unlockable items, including weapons and outfits, on a seasonal basis.
The first content drop was a new sniper map called Hantu Port, which arrived via a game update in late March.
Upcoming 2019 highlights are detailed in the roadmap image above, although IO cautions that its content plans are subject to change.
New sandbox locations set to be introduced include The Bank and The Resort, arriving this summer and fall respectively.
IO says each location will include “new targets, challenges and mastery unlocks that can be used in all Hitman 2 environments”.
A new sniper map called The Prison will arrive this autumn too.
For those who didn’t buy the Hitman 2 silver or gold editions, a $40/£33 expansion pass offers access to all of the game’s DLC.
IO has also committed to releasing free Hitman 2 content for all players, including a series of “elusive targets” — unique contracts that are only available for a limited time.