There is no reason for the sudden and dramatic rise in volume. Insider trading? Very possible that some traders have become aware of impending negative news regarding gox and want coins off the exchange. We've been on the edge since the Dwolla news.
I seriously doubt the coin exodus is still happening this long after the Dwolla news. The pattern it's following from 125-130+ is the same it followed from 115-120+. When the big players want to move the market, volume moves with it. When the big players don't move the market, volume stagnates.