Baseball seems to be growing exponentially in Australia (which isn't saying a ton since it's growing from basically nothing, but still).
London...I wouldn't be against having the season-opening series abroad turn into an annual thing. It can work for short stints like that...and while I can't imagine this attracting a ton of interest from a tonne of Brits, the ex-pats would fill the stadium alone.
I'd like to see this in Amsterdam in the near future, though fitting it into an appropriate venue would be quite the challenge. Seoul seems like a logical choice as well.