From what I get from reading this: the league is going to be reviewing plays after the game is completed to determine if there was or was not a flop.
So last night, if the Celtics were flopping like Rasheed is complaining about, then the league would review the plays today and assess fines. So for the sake of argument, let's say the league determined the Celtics flopped 3 times last game. They're not going to go back and reverse the calls from last night so the outcome will still be the same. The C's get the win, but a few players get hit with fines which I would guess would be on the light side of 5k or 10k. If you have a chance to win a playoff game by flopping, a little fine that will be determined days later is not going to deter me. Players get fined for technical fouls right now, but that doesn't really seem to stop players from getting technicals, so why would a fine for flopping be any different? It's already been said, but the best way to stop flopping is to call nothing. If you flop and the refs call nothing, your man is getting a wide open shot. Giving away uncontested layups to the other team would help stop flopping real quick. Educate the refs. Call nothing!
Also does the league really know who pays the fine? Say Rondo is fined 10k for flopping, but because of the flop the C's won the game. If management actually pays the fine for him (as a thank you for doing something that got the win) would the league even know? I'm sure it's against the salary cap rules, but really who would know? How does the league determine this?