Bioware has just announced the final DLC for ME 3 singleplayer, called Citadel. On the Bioware forums, Chris Priestly informs us on this DLC. source: http://social.bioware.com/forum/1/topic/324/index/15961411/1
A quote, then from Pristly's post:
When the adventure is over, reconnect with your favorite characters from the Mass Effect Trilogy, try your luck at the Citadel’s Silver Coast Casino, blow off steam in the Armax Combat Arena, or explore and furnish Shepard’s own living quarters on the Citadel. With unique content and cinematics featuring your friends and romance interests in the Mass Effect trilogy, Mass Effect 3: Citadel offers one final chance to see the characters you have known for years and rekindle romances.
The DLC will be released for all platforms on March 5th 2013 - for the PS3 version in Europe the date is March 6th 2013
Looks like Bioware has listened to the many complaints about the original ME3 endings, then...