I sideloaded this firmware to my Glo, it is working okay. A few things I noticed that haven't been mentioned above:
Downloading from DropBox desktop is working again. (Downloading from DropBox mobile still doesn't work.)
The books list view displays the book's subtitle in a smaller font on a separate line, like the series title/index. (Previously it displayed inline with the title, separated by a dash.)
There is a new(?) option "Swipe left edge to adjust brightness" in Settings > Reading settings. (I think this option could only be set by editing the config file in previous versions, unless I just didn't notice it.)
The screen doesn't refresh properly after using the dictionary or highlighting. This had been fixed in the previous firmware version 4.5.9587, now broken again.
I don't much like the additions to the books list: The "Go to page" button and "..." menus beside each book just clutter up the display to no purpose, these functions could already be accessed by tapping the page number or long-pressing the book title. The other book information is now squashed up to make room for the useless "..." button. (see screenshot from my Glo below.)
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