The early retirement of BOJ Governor Shirakawa is cause for a party in Tokyo, with the Nikkei soaring 3.8%. The dollar strengthened vs. yen - nearly tapping on 2009 levels - before backing off to about unchanged on the session. BOJ board member Takehiro Sato says achieving the new 2% inflation goal would require as-yet untried QE methods. Can't wait. EWJ +1% premarket.