I own a top-of-the-line early 2009 iMac and it's still going strong, but I can sense its slowing moments. I told myself I'd buy a new one every five years. Obviously this is the sixth year, but that's only because I wanted to hold off for the iMac that brings major changes, unlike 2014's update featured. Do you think 2015 is the year for the greatest overhaul? If so, what changes can you sense are coming?