Brand new engines, called the L-series. They're complety different from the FS.
2.0 liter engine:
Type: LF-DE
Displacement: 1999cc
Cylinders: 4
Valvetrain: DOHC 16 valve
Horsepower: 148 @ 6500rpm (144 @ 6500rpm for C.A.R.B.)
Torque: 135 lbs/ft @ 4500rpm (132 @ 4500rpm for C.A.R.B.)
Bore & Stroke: 87.5 x 83.1mm
Compression Ratio: 10.0:1
Induction Type: Natural
Redline: 6500rpm
Alternator output: 12V, 90A
Ignition type: distributor-less coil pack
Fuel system: Multipoint EFI
Manual Transmission type: G35M-R
compared to the P5s....
2.0 liter engine:
Type: FS-DE
Displacement: 1991cc
Cylinders: 4
Valvetrain: DOHC 16 valve
Horsepower: 130 @ 6000rpm
Torque: 135 lbs/ft @ 4000rpm
Bore & Stroke: 83 x 92mm
Compression Ratio: 9.1:1
Induction Type: Natural
Redline: 6500rpm
Alternator output: 12V, 80A
Ignition type: distributor-less coil pack
Fuel system: Multipoint EFI
Manual Transmission type: G15M-R
Also from the Mazda3 and Mazda6
2.3 liter engine:
Type: L3-VE
Displacement: 2260cc
Cylinders: 4
Valvetrain: DOHC 16 valve
Horsepower: 160 @ 6500rpm
Torque: 150 lbs/ft @ 4500rpm
Bore & Stroke: 87.5 x 94.0mm
Compression Ratio: 9.7:1
Induction Type: Natural
Redline: 6500rpm
Alternator output: 12V, 90A
Ignition type: distributor-less coil pack
Fuel system: Multipoint EFI
Manual Transmission type: G35M-R
Both L-series engines are supposed to be CRAZY strong, with tonnes of potential. The Mazda6 2.3 Drag car is supposed to be capable of upwards of 1200hp.