Don't believe anyone's mentioned this, and I don't recall seeing it in the list of changes:
When having audio auto-play when a flashcard pops up, the Audio will play with the last-used speaker. E.g. If, on the previous card, I had listened to the Audio three times, going Male/Female/Male, then this second card would play Male, as would each and every card after it, assuming I did not manually play the audio at any point.
However, if after some number of cards (> 1) I then play it once, I would get the female voice, and it would now default to using the female voice instead of the male voice (but will still alternate if I play it manually. This only applies to the single auto-play when a card is first shown with Audio selected). This is true both before and after the reveal. I don't believe it worked this way in 2.0.0 - instead of default to the last speaker, it would default to the alternate of the last speaker (Thus going Male/Female/Male on a card would have resulted in the next card playing with the Female audio first, rather than the Male).
I'm not sure if this was a deliberate change or not, but it seems a little odd to me, and might be better solved by having yet another option for defaulting to Male/Female when moving to a new card.
Also, a not-really-a-bug bug: When doing a CPU intensive-task (e.g. decoding an AAC+ stream that I'm pulling off the internet), I need to draw continuous strokes very slowly, otherwise Pleco seems to lose parts of them. Not sure if you can do anything about this, but there we go.