Gox's new trading engine and all of the upcoming exchanges (ex, Coinsetter) are completely unnecessary given the total volume on all current exchanges.

Prediction: 4-5 months from now, there will be at least a dozen new exchanges, most averaging about 1,000 daily volume. This "fracturing" of volume will ultimately result in lots of smaller and consequently more easily manipulable exchanges. Gox will still maintain the lead with 5,000 daily volume on the very busiest days. But, Gox too will be primed for manipulation given lower volume and depth.  

Prediction 2: 1 year from now, after enough reports of manipulation and investors getting ripped off, the SEC steps in and requires exchanges to monitor and put in place restrictions to stop blatant manipulation (or at least make it much more difficult/risky). Bitcoin gradually drops in value to almost nothing as the community realizes the price is and always has been driven by whale-walls.