Porsche's long-rumored Boxster coupe will be called the Cayman. Lighter and stiffer than the ragtop, the 295-hp, 3.4-liter Cayman S will debut for about $60,000. We hear it's faster around the Nrburgring than the 3.6-liter 911 despite a 30-hp deficit. Will Porsche finally have to concede that mid-engine reigns?