I've got a feeling based on watching the 4.1 trailer that the 'plot point' in question is what exactly Raubahn promised Nanamo after winning his freedom in the Colosseum in Ul'dah (and enough money to not only buy the Colosseum outright but also a place on the Syndicate) - the scene of Raubahn's high-stakes gladiatorial fight in the Bloodsands shown in the trailer is actually from 1.0, so it fits. But we'll find out soon enough either way.