Amazon is rolling out another update for its Kindle ereaders, one that includes an announced feature and a few hidden hints about upcoming features.

Kindle update 5.12.3 is available for all Kindles dating back to the Kindle Voyage, and according to the changelog adds:

Library Badges: Prime and Kindle Unlimited books in your library are now badged.

Prime and Kindle Unlimited books in your library are now badged. Performance improvements, bug fixes, and other general enhancements.

I am not sure what that means; do you?

According to an early report from MobileRead, this update also fixes the widows and orphans bug introduced in the previous update. JHowell also reported finding hints in the code of a new K++ feature:

Looking into the new firmware I see an unactivated feature, called KPP or kindle++ internally. It involves a redesigned “Aa” menu. Strings include: “Some reading options have moved” and “Go to the Aa menu inside a book to find settings including Popular Highlights, Book Mentions and Word Wise.”

There’s no word yet on when we will see that feature, obviously, but if you want the library badges, you can go to Amazon.com and download the firmware update for your Kindle model from the Kindle Software Updates page.