Quads in the 13" are pretty much a given as all U series 8h gen chips so far have been quad and there's no indication that will change for the 28W chips or the 15W with Iris graphics.
Hexacore chips are likely, though the full lineup isn't yet known, and the G chips with the integrated radeon graphics are still an option (though seemingly less so now than was originally speculated)
There was the analysts note that they were pushed back because 'the battery failed a key test'. I'm speculating on the exact amount of time they were pushed back by, but a few months from June to October doesn't seem wildly implausible.
Actually, WWDC has often had hardware announcements in tow - '14, '15 and '16 look to be more exception than rule. That's certainly some meat for them to go on this year, but the trend is definitely downwards overall. Look back at the sort of things they were announcing in ~2007 vs 2017.