Probably a minor refresh for Haswell. I wouldn't expect too much.
Pure speculation, but maybe they had some integration difficulties and didn't want to commit to a specific timeline, or they couldn't release it /right now/ like the MBA so they wanted to hold off to fill out their fall event. There are a ton of other things that could have held it back; perhaps Intel isn't ramped up enough on volume production of the quad-core Haswells and they didn't want to just update the dual-cores first.
Exactly, that's all the MBA refresh was - much to my girlfriend's disappointment - no retina display (but if the Air got a retina display, there ends up being very little to differentiate between the Air and the new Pros).
Yes! Totally yes!
I held off buying a MBP just so mine would be one generation better than my coworkers'.
I just know there's a MBP in the pipeline, because the inventory has been allowed to dry up. Why wasn't a new model announced?