As for the observed transactions, it would also make sense if it was mtgox. Someone bought a lot of coins during the drop, and cashed them out, forcing mtgox to refill the hot wallet.
The best way to check (without MagicalTux confirmation) would be to correlate it to the ask side of their orderbook (supposing it represent a stable % of all btc deposits, which is not perfect, but should still be ok).

https://blockchain.info/address/1E9k79dLuhfspdEtymzP7vhaYVGFcdfsYs
Follow that 20k.

What is the point of this? As of now, there are 18 different confirmed addresses the 20k transfers to, making small (relatively) deposits on the way. What is going on?

Oh boy, those 20k BTC from earlier are moving like bees with diabetes from one flower to another. I cant even keep track of that money. Looks like when it finally arrives, it will be clean as a whistle.

The 80k BTC are still staying put.
https://blockchain.info/tx-index/16394734/d2f25503cf1ddf56c65635d449b17c72c32e696cd7f4fca1aeb94392675f19ba

The remaining 80k BTC just set in motion. Laundering in process..

https://blockchain.info/address/1PecDbc6fshLFXJHRmFFv6PEc63MkX6Knu