I last tested this when it launched, I normally get 250-300 ping on NA server, with TPG ADSL2+ in Canberra (east coast australia). Connecting to the SEA server previously has seen my ping shoot up to 400+, and old pingplotter traces showed the traffic being routed to the USA first then back across to ASIA to hit the server (which explained the ping times!!).
When I tried to test recently though I noticed the old IP addres is 100% unreachable these days as others posted in this thread I see, so I need the correct IP address to do some up to date ping plotter tests and then I will post results here for those interested.
This is the new address: login.worldoftanks-sea.com
From Malaysia I still get routed to Hong Kong before making a return trip to Singapore, but it doesn't go to the US anymore. Ping times for me are around 50ms in the mornings but jumps up to 150ms in the evenings, though it's still a major improvement over the 300ms I get connecting to NA server.