Autocar states the new Porsche turbo four cylinder won't come until 2016. The Macan SUV is sure to get a VW sourced 2.0 liter turbo four-banger as an entry level motor. What is likely more accurate is Porsche's own built turbo four cylinder which is said to be based on the current flat-6 motors won't be seen until 2016. But... another source states the motor will be ready by the end of the year and that would mean a debut at the Frankfurt auto show this September although with the Boxster/Cayman just launching this seems unlikely. The Cayman "S" or "Turbo" featuring this motor is likely to bridge the gap between the highest performance Cayman model and the base 991 Carrera if not exceed the current 911 Carrera which makes sense by 2016 when updates will be due.
The engine is expected to be all aluminum and direct injected. Basically, expect a Carrera S 3.8 DFI motor with two cylinders missing. The redline is expected to be in the 7500 rpm range with a displacement of 2.5 liters and a 2.0 liter version also may be in the works. This is one we will all just have to wait out.