I would say that the 1/2 zip fits the same as current outerwear. I have several different "vintages" of items and they are all pretty true YOY.
The base layer might be a different story. I just got one of the new Pique Dry Polos and it runs a much better fit than previous years. Better (slimmer) body fir, longer tails and a nicer sleeve fit. So asking is a good idea...
I have not seen an at stores yet either, and with fall fast approaching, would expect them out?