Could find two new features in this update, merge sketch and embolden glyph. Merge sketch is supposed to merge the scribbles and create a new PDF file, but it does not work at all. Says "Sorry, merging sketch failed. Maybe this book's content is not supported well by our program, you can contact our support for help, thanks!" Embolden glyphs makes the font look funny with a lot of jagged edges.
They have fixed the problem with the display refreshing several times on waking up from standby. I have left it in standby now to see if the battery drain persists.