Puzzle-specific statistics are now displayed before and after each puzzle is solved. You'll now get a view into each puzzle's solve rate as well as average and record solving times. If you beat the record time, you'll see a little message saying "New Record!" next to your score.
Note that puzzle statistics shown after you solve a puzzle are the statistics before you solved it. There is always a bit of confusion when someone gets a new record time and sees another player with a worse time listed as "Record time". That is the previous record time, to show you how much you've beaten it by.
If you notice any weird behavior with the puzzle stats please let me know. Stats will not yet display for a handful of puzzles - they will only display after a puzzle has been solved a certain number of times, otherwise the stats are relatively pointless.