A McGraw-Hill CEO went on record during an interview with CNBC admitting they’ve been working with Apple for “quite a while” on the tablet that Apple is announcing tomorrow. So much for secrecy. Thankfully, I doubt Apple would refrain from announcing the tablet tomorrow just to make this guy look silly, but I’m sure he’ll get an informative lesson on how secrecy works at some point. Madness you say? This…is…Apple!

After nearly two years of rumor and speculation, it seems the clamor for an Apple tablet will finally be met with an official announcement. Will it finally arrive? Will we also see updates to the iPhone OS? The iPhone itself (additional carriers beyond AT&T, perhaps)? How about iWork and iLife? To find out, join us on Wednesday as we begin our live coverage at 9:00 a.m. PST.