Wallet 0 has sold 400K, probably pissed off waiting for dev.
I don't think they sold - hasn't been any large sells in the last few days. More likely he has withdrawn 400k from Bittrex.
I've been watching wallet 0 and I can confirm he has withdrawn (not sold) 400K coins.
It would be silly to sell IMO, unless you need the money which means you were overinvested anyway.
PR twitter account was very active last month when the price rose in anticipation of MegaUpload 2.0.