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If they distribute it in changed form, they are required to do so for free. Section 2b of the GPL (conditions for modification and distribution): "You must cause any work that you distribute or publish, that in whole or part is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this license."
For them to sell their version of Slash -- without also making it available for free -- seems illegal to me. However, transfer of ownership of the modifications is not the same as distribution, is it? If they sell it to a single party, that might be allowable. But IANAL. OSDN's lawyers would likely be notified, and it would be up to them whether or not to care.
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