2K Games will release the first batch of BioShock 2 DLC on Thursday.
Dubbed The Sinclair Solutions Tester Pack, this will be available for PC, PS3 and Xbox 360.
The emphasis is on multiplayer, where ranks will be boosted to 50, two new characters added, 20 extra trials introduced, a third weapon upgrade unlocked and five more masks uncovered.
Sinclair Solutions costs 400 Microsoft Points (£3.40/4.65) on PC/360, and $4.99 on PS3.
There's more DLC to come in the following weeks, although nothing has been set in stone.