Nokia has been circulating a memo that has fueled beliefs the company is about to undergo a major platform shift. The note by new company CEO Stephen Elop characterizes Nokia as "standing on a burning platform" where its insistence on Symbian and the status quo has left it attacked on all sides. A TechCrunch copy of the note from late Tuesday has Apple's iPhone controlling the high-end, Android the mid-range and a slew of Chinese companies getting the bottom.