I just got this weird letter from Amazon. It says that I must update my Kindle DX firmware by March 22, 2016 or I will no longer be able to access Kindle Services. The weird thing is that it doesn't mention whats actually whats in the firmware.
You'd think the email would contain a better explanation. There is some speculation on the web. I even checked Amazon's firmware update page. I mentions some new functionality, like pan and zoom, but nothing related to Kindle Services. Whats up Amazon?