The reason? The 4 heirs of JACK "KING" KIRBY have filed to reclaim the copyrights of the characters created/co-created by one of the most influential men in comics.
MARC TOBEROFF, the attorney who successfully wrangled the copyrights of Superman to the Siegel heirs, now represents the Kirby heirs. This is a pretty tall order, considering that Kirby created/co-created Fantastic Four (copyright eligible in 2017) , The Hulk (2018), The X-Men (2019), The Avengers, Thor, Black Panther, Silver Surfer, Nick Fury (yes, the white one), Magneto, Galactus, Captain America, and Doctor Doom... Basically, the entirety of the Marvel House. The earliest the copyright claims will be heard is 2014, so Marvel's got time.
Under copyright law, the author or his heirs can begin a process to regain copyrights a certain period of years after the original grant. If Mr. Kirby’s four children were to gain the copyright to a co-created character, they might become entitled to a share of profits from films or other properties using it. They might also find themselves able to sell rights to certain characters independently of Marvel, Disney, or the various studios that have licensed the Marvel properties for their hit films.
Copyright issues have become increasingly difficult for Hollywood, as it continues to trade on characters and stories that were created decades ago, but are now subject to deadlines and expiration dates under federal copyright law.
Disney may not end up with full ownership of many of Marvel's Most Famous super-heroes if new copyright claims by the children of the late artist Jack Kirby prove successful. (Or will they? I'll get to that in a moment...) If Marvel, Disney or any of the other companies challenge his claims, it may be a complex legal process to determine what exact role Kirby played as creator or co-creator of various characters who first appeared nearly 50 years ago.
The copyrights would then run for 39 more years before expiring, after which the characters would enter the public domain under current law. Of course, you know that Marvel wouldn't allow any one of their characters to float out into the ether.
...In fact, you may even say this little move is timely.
As some of you may recall ( see Marvel? A Mouseketeer?), I ended the post with the question of if Mice ate spiders... (Disney as art of war, perhaps?) If the Kirby clan can be convinced by the Mouse House more so than the House of Ideas, we may very well have a definitive answer in the years to come.