this is a good comparison to the 997TT pictures:
...those are looking quite equally, BUT this is the prototype of the 2005 987 Boxster seen at Porsche’s Weissach proving ground on the outskirts of Stuttgart. the roadster is estimated to hit the road in winter or spring ´04/´05 the coupe a year later.
the details for indicating of beeing a Boxster are:
-two seater
-mid engine layout (note the blacked-out rear side windows and firewall behind the seats)
-long wheelbase ( today’s Boxster have a 6.35cm longer wheelbase than the 911 )
-muscular hip line
-short rear overhang
-small spoiler
Porsche`ll again use the 2.7-liter and 3.2-liter flat-six engines but with increased power ( ~235 for Boxster, ~270 for Boxster S ) and a six-speed double-clutch manual gearbox similar to the system offered on the Audi TT. After the launch of the Roadster and Coupe, a series of performance modells are planned, including a stripped-out Boxster Clubsport model.