Can someone please explain me this current legal stuff regarding Superman? Did DC lose the rights for Superma's origin regarding the planet krypton and daily planet?
Back in the 1990s, Congress gave multimedia corporations a big gift by extending copyrights on properties on a bunch of properties. They also decided since originally the corporations bought non-"work for hire" properties from authors on the assumption that they'd only be buying the rights fro 54 years that the original creators and their families would be entitled to some of this windfall as well. The mechanism Congress came up with for coming to an agreement was that the creators and family could file to reclaim the copyright after the original period has expired.
Siegel and Shuster created Superman before employment by National (later DC). Basically they put together the Superman section of Action Comics #1 and put some scripts together for some future stories and shopped it around. National eventually bought the rights. And owns everything beyond what Siegel and Shuster brought to them initially lock, stock, and barrel as work for hire.
In 1948 there was a lawsuit involving Superboy by Siegel that was eventually settled. In the 1970s, faced with a wave of bad publicity before the opening of the Donner movie, Siegel and Shuster were granted a pension of around $35K a year. Now, with Superman beyond the original copyright period, the family has asserted their rights to reclaim the copyright for stuff in Action #1, Clark Kent, Lois Lane, costumed hero with limited powers, Daily Star, and related which turns out to include some of the origin.
Right now, DC and the Siegels are basically involved in a profit sharing arrangement since DC has half the rights and all the trademarks. That could change in 2013 when the Shuster heirs enter the fray.
I think most analysts think that a settlement will eventually be reached. Superman is at his most marketable with all of his trappings, not the limited 1938 version. The first step of the process is to figure out what the Siegels actually have the rights to. That's basically going on now, and a Judge is making a ruling on that since both sides disagree. Once that process is finished, they can start negotiating a settlement when Time Warner knows what it's actually buying and the Siegels know what they're actually selling.
I expect that there will be some hardball played in the meantime by both sides. There's no question though that an equitable settlement is the best outcome for both sides, so entitled fanboys shouldn't get their panties in a knot. There are no "good guys" or "bad guys" here, only interested parties with legal rights.