images and puzzles now can have titles and notes
when you complete a puzzle, elapsed time is shown
there's a new startup option to use a single tray instead of isolating the edges
the "random" curve option is now customizable (choose your own curve-type frequencies)
long-press versus touch distinctions are replaced with thumbnail menus
exporting (was called "sharing") is better integrated, no more "sharing mode"
image cropping is separated from the importing process
importing is more direct (no more "inbox")
most settings are now stored with the puzzle, simplifying their semantics
scrolling of a large puzzle within the solving area is simplified (no more "two finger" scrolling)
piece border options are simplified and borders look better
more graceful jigsaw curves
default settings are friendlier to jigsaw fans, rather than emphasizing other cuts
tray naming is simplified
zooming is now continuous using pinch gestures and the current zoom is always displayed
Many bugs have been identified and fixed.
The help is substantially revised with some detailed instructions on how to import images from popular image sharing services.
For fresh installs (only) there are more supplied images and now also supplied puzzles cut from those images using the different curve types (you won't see this when upgrading from an older version because upgrading preserves your collection of images and puzzles exactly).