Well, this had to happen eventually: Someone from one of Apple's tablet partners - McGraw-Hill's CEO, specifically - has finally confirmed that tomorrow's announcement is a tablet.
MacRumors caught the slip during a CNBC segment, in which the anchor lobs generic softball about the tablet. Instead of deflecting, the guess just spilled the news all over the place:
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. 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.