You're probably right, but why post a blog about it announcing it to the world as if it is available before everything is synced up and ready? It makes Google look sloppy, IMO.
You'd be surprised at how often they do that. It happens with virtually every announcement.
I guess either you announce it after everyone's already seen it anyway or you announce it before it's released everywhere.
They say that they "Are Rolling out" not that it's "Immediately available", it takes a while for it to go live on a million+ servers.