You good folks might have heard a mention here or there about "some Superman lawsuit." But after the news just now coming out, I'm pretty sure you'll know more about it.
According to The New York Times:
"A federal judge here on Wednesday ruled that the heirs of Jerome Siegel -- who 70 years ago sold the rights to the action hero he created with Joseph Shuster to Detective Comics for $130 -- were entitled to reclaim their share of the U.S. copyright to the character."
Apparently, the international rights to Superman remain the property of Time Warner.
There's also the chance that if this decision sticks it will open a can of worms with the heirs of 'Supes' co-creator Joseph "Joe" Shuster in 2013.
And it's also become a question-mark as to whether or not the Siegels are owed any profits for film ventures like 2006's Superman Returns or its currently-in-development sequel Superman: The Man of Steel for 2010; not to mention, the increasingly looking-like-its-not-going-to-happen-anyway Justice League Mortal!
Personally, I don't see this delaying any of them directly; no more than any other factors which would delay said film projects.
This thing will continue to be dragged out in the courts for years.
Time Warner (via their legal muscle) will probably get this decision over-turned. At least, that's what I see happening.
Source: The New York Times