Usually that it an indication that earnings (especially earnings per share or EPS) are expected to drop.
If you look at the analysts estimate page on Yahoo, it shows year ago EPS 4.31, and expected EPS for 2013 as 0.51, and expected EPS for 2014 is 0.69.
Such a drop in earnings would cause the PE to increase by the ratio of the old earnings to the new earnings.
The ratio of 4.31/0.51 is approximately 8.45. With a current PE of 5.08, you would expect the new PE (all else being equal) to be 43 or so. (5.08 multiplied by 8.45 is just a little less than 43).
But with the drop in earnings, one might expect a drop in the price per share as well, which would mean that the PE would not be quite that high. To hit a PE of 30 (given the above analysis, where the expected PE would be 43 with no price change), the price per share would have to decline about 30%.