KFLR-FM began doing XMAS music right around Thanksgiving. My guess is that the following Phoenix outlets will be going all Christmas sometime on Christmas Eve and ending it sometime on Christmas Day:
KOOL-FM (one of two by Audacy)
KMLE (Audacy's second, though it will focus on the Christmas country songs)
KFYI-AM (They're probably going to be using a pretaped satellite network service)
KTAR-FM (same as KFYI, though with more pretaped local programming)
KXEG--I'm guessing that the satellite service this station relys on will be featuring all Christmas music probably starting at 10:00am Phoenix time [12am EST] on Christmas Eve. This will be the only new station to the Phoenix Christmas list this year.
KBAQ will probably do some pretaped classical Christmas concerts; however, since KJZZ has gone all NPR news and talk, I doubt you will hear any Christmas jazz specials on its main channel.
As for me, I'm a bah humbug kind of person--I'll probably be listening to my favorite non-seasonal songs on a computer or on one of the two oldies stations (KAZG and KOAI) that are *not* likely to go all Christmas this year.
Merry Xmas--excuse me, bah! humbug to all this year.