Question: Is there any talk of Chris Meloni returning to Law & Order: SVU for an episode to give Stabler a nice send-off? After 12 seasons, it would be a nice gift to fans. —Donna
Ausiello: Unfortunately, I’m told by an insider that it’s “highly unlikely” the big screen-bound actor will grace the SVU set again.

http://www.tvline.com/2011/06/ask-ausiello-spoilers-castle-true-blood-bones-gossip/

As far as I'm concerned, SVU is over. I hope CSI destroys it in the fall.