It's not uncommon, I've seen it a lot in England. If the group is 100% women, a lot of people would say "hey girls". It seems far less common in the US. But yes, "guys" is used as a gender-neutral "group of people". We also do it sometimes in french.
As for whether it's PC/anti-pc/whatever, this is really down to the intent behind it and how it's perceived by the recipients. If you're a woman, addressing other women as "guys", there's no ill intent (and none received). It's far more offensive to have someone else police your words...
As for whether it's PC/anti-pc/whatever, this is really down to the intent behind it and how it's perceived by the recipients. If you're a woman, addressing other women as "guys", there's no ill intent (and none received). It's far more offensive to have someone else police your words...