Two words: low volume.
Now that might change but until it does it doesn't show any conviction in the reversal.
This MtGox volume doesn't look low to me. It's significantly higher than it was during most of the run-up.

I guess I should add all the markets together to get a better picture.
edit: bitstamp and btce show a similar chart
I'm not making predictions about the price movement, but I don't understand how you decided the volume was low.