The new Porsche 718 Boxster will have the same displacement engines as the TT/TTS and possibly TT-RS variants with a turbo 2.0 for the Boxter and 2.5 motor for the S. Interesting decision to match displacement with existing Audi / VAG engines.

From Porsche Press Release
The launch of the new 718 Boxster generation represents the first time since the late 1960s that Porsche is implementing sports cars with four-cylinder flat engines again since the end of the 1960s. Turbocharging significantly boosts torque. The two-litre engine of the 718 Boxster has a maximum torque of 380 Newton metres (gain of 100 Newton metres), which is available from 1,950 rpm to 4,500 rpm. The 2.5-litre engine of the 718 Boxster S even attains 420 Newton metres (60 Newton metres more) over a speed range from 1,900 rpm to 4,500 rpm.