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While this sounds great on further investigation the impact may not be very large. We checked the minimum bid price for a couple of the more popular search terms and the minimum bid price had increased to around 200 yen (up from 50).
One key example of this was "Cairns" even though there is currently only one advertiser of this keyword. Obviously Google has worked out that if the word or phrase is popular then they can still hold the price up.
However if you type in a Japanese language key word in Google.com it displays in Japanese (if you have the right stuff loaded) along with the Google.co.jp ads.
It appears the only difference relates to the forms or database set up with Google.com Adwords.
I hope this answers your question.