Let's look at futures premiums now:
Arbitrageurs of the cash and carry type are rejoicing: opportunities are returning. Don't forget to check out swapman's bitcoin futures arbitrage guide where he shows you how to profit from this.
Another thing worth noting is how Bitfinex USD margin has been changing over time. Check out this chart from BFXData
Below we see why the rates are so low, it's because there's been a lot of people closing positions over the past month: