yes, the old Apple trick...
Really, then tell me, how many ePub editors are there out there? How many? Now, of those, how many would you say are a delight to use? Uh-huh. They will probably release it for free, or charge a minimal fee, you know, like iWorks. Oh wait, what;s that, how much is MS Office? Wow, you're right, Apple does charge three times as much. And of course, Epub is, as we all know, an Apple standard, not to be used by anyone else, pretty much the same way Webkit is proprietary and cannot be used by anyone else.
You're right about one thing, it will be a success.
And to point out the obvious to everyone else: the publishing industry is at a standstill. Most of the comments of the people who claim to work in the industry can be boiled down to: "Oh no, change is gonna come, wicked, wicked, wicked change! Please don't hurt me".