All the new instance types seem to get deployed on US-EAST-1 first. It may be crowded, but it always gets the good stuff first.
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?
I see what you did there- famous Yogi Berra quote.
I hear 70% of all internet traffic goes through us-east-1