Rationing was put in effect September 14th of this year. I'd be surprised if they actually ever run out of /22s to hand out as long as there is a limit of only a single /22 per LIR.
Of course a /22 per LIR is far from enough to cover all the customers, so ISPs should take this as a strong hint, that they are behind schedule on updating.
Alas most ISPs are still not making progress. The ISP I am using ran out of addresses and started taking such measures as putting all customers behind NAT by default and reducing the number of IPs per customer for all of those, who could find the option to turn it off again.
And when I called them to complain about my laptop not receiving any response from their DHCP server, they made up a lame excuse about the network interface on my laptop being defective.