5
As someone else mentioned, this rather major OS X update could mean an iMac refresh... And if that is the case, and the other rumors about updated iPod Touch, iPod Nano and iPod Shuffle refreshes are correct, that makes a total of 5 major device updates for the day (including, of course, the new iPhone) -- so just maybe that 5 in the event invite really wasn't about the name of the new iPhone, and was a misdirection based on 5 major product refreshes. In other words, maybe the new iPhone won't be called the iPhone 5 after all, and it will go with "New iPhone" like the New iPad. Just a thought. In any case, we'll find out in a little over 10 hours.