The message reads
We’d like you to know about an important update to your Kindle Direct Publishing (KDP) account. As of December 16, 2013, the minimum threshold amount has been removed for accounts selecting Electronic Funds Transfer (EFT) as their payment method.* You will now be paid 60 days after the month your royalties are earned without needing to meet a minimum threshold amount prior to receiving payment.
You will receive an EFT payment from KDP for any royalties earned that were previously under the minimum threshold. To see if you have royalties awaiting payment, check your Royalty Reports at: http://kdp.amazon.com/self-publishing/reports
While there is no action necessary, you can review or update your EFT banking information by Amazon marketplace any time, by visiting the “Your Royalty Payments” section in your KDP Account at: http://kdp.amazon.com/account
The Kindle Direct Publishing Team
*Note: The EFT threshold for royalties earned from sales on Amazon.com.br is still R$20 for Brazilian publishers and $100/£100/€100 for non-Brazilian publishers.