Uh oh: It looks like McGraw Hill's CEO didn't get the memo about how Apple omertà strictly forbids the leaking of any tablet news prior to Steve Jobs' big presentation tomorrow. He went on CNBC and blabbed.

Terry McGraw broke two big pieces of news, as far as we can tell: That the tablet will be based on the iPhone operating system, rather than being directly derived from Mac OS X , and that McGraw Hill's textbooks will be available on the device, including 95 percent of the books his company already has in e-book format, assuming we parsed his comments correctly. And assuming his books aren't banned from Apple devices forever by daybreak tomorrow. There's video above and a transcription below, via MacRumors, which was first to re-report the comments.

"Yeah, Very exciting. Yes, they'll make their announcement tomorrow on this one. We have worked with Apple for quite a while. And the Tablet is going to be based on the iPhone operating system and so it will be transferable. So what you are going to be able to do now is we have a consortium of e-books. And we have 95% of all our materials that are in e-book format on that one. So now with the tablet you're going to open up the higher education market, the professional market. The tablet is going to be just really terrific."