The next thing he said was that apple has "a lot going on" and in the context that it was I'm pretty sure he meant regarding the sept 12 event since everyone was talking to him regarding the sept 12. I rather not screen shot for security purposes. Maybe you can go on his twitter. While I'm not a 100% sure that he meant the sept 12 release, I got a good feeling that he did mean on the context of sept 12. Also
recent rumors points out to September. And as for past history indicating that iOS and macs don't go together, history means nothing most of us thought wwdc would be the time then MT lion release like last year with the air, nothing came out. Last year wwdc nothing came out but this year did. So history doesn't mean anything. Anything could happen on sept 12 wether be iMac or not. As for the iPad mini rumors why would apple release then if they could just release 3 month down the line around feb 2013 with new iPad with the new pin connectors and everything. Apple is gonna have iPods and iPad mini with new connectors but nothing on the bigger iPad?. I dont think so. Also noticed how no part leaks have been shown up about this new iPad mini. So with that in mind that opens up time on the event for new iMacs and mac minis.
They wouldn't miss out on releasing the iPad mini before Xmas. They want to get a foothold in the smaller tablet market as well.