Final update for this thread. Having tried both new models at a Verizon store earlier, I realized that some of the people predicting high return rates on the Plus might be right. Thought about what to do until about noon, went to another Verizon store (was on the other side of the city by then) and they cancelled my Plus order for me (was still showing shipment at 10/10, still no CC charge), and now I've got exactly what I want: iPhone 6 Space Grey 128gb
To all those whose Plus orders aren't shipped out yet (the vast majority), I highly recommend you go into a store and play with both sizes. I suspect some of you, like me, will decide 6 is actually the size you'll want, so you'll be saved the frustration of the long wait and a potential return. Good luck everyone!