Just as the quarterly reporting season was looking highly predictable, Nokia delivered surprise good news, sending its battered stock soaring for once, even as Apple’s continued to suffer, dropping below the $500 level only months after many were seeing it go up to top $1,000. Of course, the two firms’ values are still a galaxy apart, but their role reversal, in terms of this week’s headlines at least, points to a new unpredictability in the mobile device market, driven by the emergence of new form factors and web behaviors. The phase which started with the launch of the iPhone in 2007 is coming to a close, and the user experience and geographic reach of smartphones is changing again, to accommodate…