As much as I can remember, us-west-2 gets new instances and features at the same time as us-east-1. (And IIRC eu-west-1 gets new stuff as well, but I don't pay

As much as I can remember, us-west-2 gets new instances and features at the same time as us-east-1. (And IIRC eu-west-1 gets new stuff as well, but I don't pay much attention to that.) Was there anything in the past few years where this hasn't been true?