I've been working my way down the list of new features and this is what I've found so far.
These seem to work well, as advertised:
- Optionally sync book files
- Optionally temp-mark a book in calibre
- Allow reordering groups in the grouping drawer
- Allow reordering sorts in the menu
- Make the top-level group name not scroll
- Support picking custom fields to group from a list
- Support picking the is-read columns from a list
- Add Languages as a groupable item
- Make "Disconnect" optionally appear on the action bar
- Support the Samsung version of Kindle for Android
This works but you might consider explicitly adding 'Samsung' to the label. ATM the word 'Samsung' is only visible on the icon.
There are 3 items which require more comment so I'll follow up with a post for each separately.