I got an update last night...
NEW: Live wallpaper API support, enabling Quicktheme to reliably work with live wallpaper apps. For an example of this in action, check out the excellent Minima Pro.
NEW: Shortcuts & gestures (Settings -> Shortcuts) both expanded and fully customizable. Gestures supported include: single/double/triple tap Home button; double/triple tap empty space; swipe up single/two fingers; swipe down single/two fingers; swipe left screen edge/swipe leftmost Home screen/swipe right screen edge/swipe rightmost Home screen; and pinch in/out.
NEW: Ability to configure action taken by a gesture. Actions include load an app, load a shortcut, toggle All Apps, toggle Quickdrawer, toggle Quickpage, open Action 3 settings, display overview mode, lock/unlock desktop, lock device, open recents, open notifications, open text search and open voice search.
NEW: When searching, use Google search box overlay instead of switching into the Google app. Can be changed via (Settings -> Shortcuts -> Global search mode).
NEW: As requested, an additional Donate option has been added for people who are so inclined (Settings -> Help -> Donate).
NEW: Animate to/from the All Apps background color when opening/closing All Apps (requires Android 5.0 or later).
NEW: Home screen indicators updated to match Android 5.1's style.
NEW: Allow importing of Action 3 layouts by other launchers. Thanks Kevin from Nova for the prod here.
IMPROVEMENT: Gesture detection works over icons as well as empty space.
IMPROVEMENT: Shortcuts to open notification panel works on Samsung devices running Android 5.x (requires granting access to the Accessibility system unfortunately).
IMPROVEMENT: Size and positioning of Google search widget perfectly matches with the Google app on tablets.
IMPROVEMENT: "Remove Shutter" option is available both when picking up and putting down a Shutter and from the overflow menu.
CHANGE: No longer default to opening Google Now when swiping right on leftmost Home screen. This option can be configured via Settings -> Shortcuts -> Leftmost Home screen -> Search.
CHANGE: Increase default double/triple tap delay to 275 milliseconds.
FIX: Use light touch effect when Up button is pressed in Settings.
FIX: If a Shutter/folder is open on the Quickpage, don't close Shutter/folder and Quickpage with the same swipe gesture.
FIX: Fix behaviour oddities when changing settings via the "Action 3 Settings" All Apps item.
FIX: Misc. stability fixes.