Really? I didn't think they'd do anycast on their reverse proxy servers, that seems risky to me (ie: a TCP connection changes from one server to another due to a BGP change), but I suppose the odds are fairly low.
I seem to remember getting different IPs from different locations, but it could just be random or I could be mistaken.
EDIT: Tried now and it seems I'm getting the same IPs from Canada and Australia, so you are indeed correct.
Pretty much all major CDNs use anycast today for load balancing, rolling downtime and security/ddos protection. Http/tcp connections are usually short-lived, relatively cheap to setup (since it's an edge network anyway) and BGP route updates don't happen that often.
