So it's not the powers, but the origin story they could lose the rights to use. I wouldn't worry -- DC will pay the Siegels for the rights, either buying them outright or a long-term lease.
I noticed they have just published 'The Greatest Superboy Team-ups' or somesuch in TPB. I didn't notice it in the comicshop at first because Alan Davis hadn't drawn the round-faced Superboy I'm used to.
Considering that there has been some kind of block on DC reprinting/using Superboy for a while now this is a good sign. They seem to publish these standard colour collections shortly before the Showcase/Essential versions, so it's looking good for behind the scenes deals and Superboy reprints...
Ah. Finally got to look at it. Well, since I haven't read the Superman comics on a regular basis in years, I suppose I'm not too worried about it. I suspect that Rob is right - a crapload of money will change hands, and things will go on as they have been.
My understanding is DC holds Superman trademarks. Also, DC should still own the vast majority of published Superman stories. So the Siegel and Shuster heirs are probably in a strong position in relation to DC, but they also probably have an interest in keeping DC interested in continuing to publish Superman.
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Considering that there has been some kind of block on DC reprinting/using Superboy for a while now this is a good sign. They seem to publish these standard colour collections shortly before the Showcase/Essential versions, so it's looking good for behind the scenes deals and Superboy reprints...