The payment filtering doesn't seem too complex. The wallet where all the payments seem to originate is down to 33.84040531 BTC as of now, down from ~131 BTC on Friday. It actually hit zero briefly before new deposits got swept up. I would guess the Thursday transfer of 385 BTC into two new wallets of 200 BTC and 185 BTC will be profit taking by the ringleaders (I doubt any regular MTI members had accounts that large). Saturday night withdrawal was ~195 BTC so people are getting out. Ship has likely sunk.
I expect people will start seeing delays in payments now until new deposits arrive, so I don't think it'll take long before word gets out and deposits disappear. Unless maybe they use another wallet for some of the transactions? Seems unlikely given the master wallet total incoming funds is now at ~14562 BTC so I think they filter everything through a single wallet (easier to code for Johann), so will make tracing of the big payouts much easier, not that it'll help much.
That's a staggering amount of money people have put in. Seems like maybe the trading pool size wasn't a completely made up number, because that's about how much they claimed to have.