If they had minor Mac introductions they would have just appeared on the store a week ago (they wait until event time to decide what makes the cut in case something has production delays, then they push out the stuff that didn't make the cut the week before the event.)
That they made no mention of the Mac means that they will have another event in early October (they need to be on the market by November and December so early October gives enough breathing room from this event and enough timing to have another event.)
I think if they just had the new Macbook it would have been mentioned today.
That they didn't makes me think that at least three major product announcements will be made in October.
-- Macbook Pro new model I expect. -- Display with built in GPU I think is a distinct possibility -- New Mac of some other kind if they have something significant (eg: not just a revision with the latest intel processor) -- They might have something genuinely new (it still happens.)
I'm certain enough about this that if I could predict Apple's stock movement based on an event, I would be buying options with an early October expiration.