Announced via BioWare fact sheet, anyone who purchases Dragon Age II for any platform and registers the game by April 30th will receive a free PC download code for Mass Effect 2 through the EA Store. Full instructions belows:
1. Activate the Online Pass content that came with your copy of Dragon Age II (The Black Emporium).
2. Start the game and log in using your EA Account or create a new EA Account.
3. Visit http://social.bioware.com/me2offer and log in with that EA Account.
4. Enter your Online Pass code and click "Submit". You will then be provided the code for Mass Effect 2.
5. Open the EA Download Manager and enter the code to commence download (if you don't have the EA Download Manager installed, it can be found here: http://eastore.ea.com/eadm).