Yes, I see ePub as very much of a potential successor to Mobi in terms of multiple device support, multiple stores, and multiple providers. It'll be interesting to see what happens to it. I think, though, it all depends on having a commonly-agreed DRM format. I know that ePub can support DRM - do you know if a standard for it exists yet?
(I know that most people think DRM is a Bad Thing, but we have to face the reality that most publishers aren't going to use a format without it.)
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