Are there future plans for Kaiser hospitals in Arizona ?
No there isn't. Kaiser isn't in Arizona and they don't start with hospitals. So, even if they decided to tap the Arizona market tomorrow, it wouldn't be a hospital. Maryland / DC / VA has dozens of facilities, but not one hospital yet. THAT is in the plan, but that's how far they'd go before they can support a hospital.
You would have to ask them. Go to their website kp.org and see if you can find that.
How the H*ll are we suppose to know? Do you realize you are asking a general forum?