To respond to Milos:

We are aware that there is some question in some jurisdictions about the application of "or any later version." Creative Commons International in Berlin has a great person to ask about this -- Catharina Maracke, its director, is perhaps the CC-DE lawyer you'd want to contact.

To answer your third question, I don't think we're viewing CC-BY-SA as something we'll need to escape from.

--Mike