The weird thing is that Apple [presumably] has Mac Pro, iPad, Mini and MacBook Pro updates still to go before Christmas.
That's a lot of announcements sandwiched into October and November.
I know the last two aren't confirmed, but Apple revved the low end MacBooks, and it would be weird to deny high end users the option of this year's internet standard (ac) when shopping for a laptop for the new school term.
And even though the Mini isn't really loved by Apple, when the Pro price is announced there had better be an affordable desktop option or the "Apple is for rich people" line is going to be all over Facebook.
So my thinking is there's an October iPad 5 introduction, with a fairly silent MacBook Pro update to add 802.11ac and Haswell.
Then there's a November Mac Pro/Final Cut announcement with Thunderbolt 2 being prominently shown off, and a quiet Mini announcement simultaneously. The Mini has a more powerful $999. model, and both desktops use the new Apple Retina Pro Display (or whatever they call it.)
Since Apple makes a big deal about Black Friday in its stores, I'm assuming these happen well in advance of that event.