Underfire, Wiz,
This has been discussed before, and I'm too lazy to type it all again. There's a thread "A320 with Sharklets" in which I've made a couple of posts. Good detailed info there.
BTW, sounds like a suspect training & safety team if the pilots weren't briefed on the introduction of sharklet A320s in the fleet. There are fuel imbalance limitations, auto-land crosswind limitations, and a whole bunch of other stuff that the trainers love bringing up every 6 months! LOL!
I've never flown a 737, so I'm not going to pretend I know anything about that bird, but would be happy to talk about the A320 sharklets if you'd like.