Custom Content Builder
This new update features a custom content builder that allows you to create/share/edit/import your own material. This means you can use POLYGLOCK as a flash card/aim trainer not only to learn Japanese through the officially supported suite, but to learn anything you want to. That could be learning another language, studying for University or simply some fun trivia. 
New Keyboard Visuals
The in-game keyboard has been updated from the 2d layout to 3d, complete with animations and sound effects to replicate an actual keyboard. You can choose from a variety of different key press sounds in the options.
Other Updates
Additionally, there have been innumerable small tweaks and improvements made to the front and backend of the game. Most notably, there have been significant improvements to performance, especially when using the endless mode.