The DLC releases on March 5th, 2012, as was previously leaked.Priestly specifically says "You may of course continue on to play the endgame after completing the Citadel DLC, but there is also a natural “stopping point” that should make it clear where the DLC content ends and your return to the main game begins." The DLC content will NOT affect the ending.
![mass effect 3 citadel dlc mass effect 3 citadel dlc](https://dvdbash.files.wordpress.com/2014/03/widescreen-gaming-mass-effect-3-femshep-05-citadel-dlc-apartment-dvdbash-001.jpg)
Or you could just wait until right before the final mission and play it all unlocked.
![mass effect 3 citadel dlc mass effect 3 citadel dlc](https://i.ytimg.com/vi/xzqWiynVdUA/maxresdefault.jpg)
Since the Citadel DLC was released there's been all kinds of misinformation and claims of fake information flying around. Hardcore fans of Mass Effect 3 have known about the potential Citadel DLC for months now, as the information was datamined and released to the Internet, but nothing was ever confirmed.