Well they've changed the sit-n-go leader board and now there's a HU sng leaderboard, but both appear to be related to how many you play, not actually how well you perform.

There's also a bad beat jackpot.

And a 10% bonus on VIP points for sit-n-gos but it reads somewhat ambiguously.

Sit & Go Boost - CarbonPoker

Nothing really earthshattering though.