Bioware has finally announced the first piece of DLC that you can purchase separately outside of the Cerberus Network. Mass Effect 2’s first Purchasable DLC (PDLC) is currently titled “Kasumi’s Stolen Memory”.
The PDLC will make available a new thief named, obviously, Kasumi. Kasumi will be found on the Citadel and provide you with some new missions and tack on a new achievement upon their completion. The only details available about those missions are that they involve some stolen art and you will (assumingly) help in their recovery. During those missions you will unlock a new weapon called the Locust Weapon, with no details yet released about it.
Price and date of its release have not been set.