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After the last messsage from google adsense this is what they are saying to all PUBLISHERS

you have the option to add a referral unit for AdSense within your account when you target any referral unit to Japan and/or any countries in North America and Latin America. To ensure payment for valid conversions, we recommend that you check the targeting settings on your current AdSense referral units.

We'd also like to let you know about upcoming changes to the referrals programs for Google Pack and Firefox:

Google Pack: Currently, you can earn up to $2 when a user downloads and runs Google Pack for the first time after being referred through your link or button. Starting the third week of February, each successful Pack referral will earn up to $1. This change will apply to all referrals for Google Pack and is independent of user location or publisher location.

Firefox: We will also be reducing payments for Firefox referrals from China during the third week of February. This specific referral payment change will only affect installations from users in China. As with referrals to AdSense, this is independent of your location as a publisher.