Most of the changes are expected to come under the hood. A 5.0-liter V8 will replace the current 4.6-liter V8, which should result in a decent bump in horsepower. It's not an all-new engine, though, merely an enlarged version of the 24-valve SOHC V8.
The real news will be the introduction of Ford's new EcoBoost 3.5-liter V6. Its twin-turbo setup should deliver more than 300 hp while delivering superior mileage compared to the 5.0-liter V8. How Ford will pitch the new high-tech engine is tough to call, but expect some sort of special edition to highlight the new power plant.