Updates from Poloniex:
busoni@poloniex: It's definitely safer to withdraw your PTS, as I don't think I'll distribute DACs we don't list.
busoni@poloniex: If we list them, though, I'll distribute... I'm not going to confiscate money that isn't mine.
busoni@poloniex: I just can't guarantee listings before we've researched, that's why I'm hesitant
Regarding Feb 28 snapshot:
busoni@poloniex: looks like I'm going to have to reconstruct PTS balances from history. Shouldn't be hard, but need to write a script.