Mustang fans of a certain age will likely remember fondly the SVO model, which was powered by a turbocharged four-cylinder. Well, our sources say that turbo four-cylinder power might be once again in the future plans for the 'Stang.

We already know that an EcoBoost turbocharged four-cylinder that displaces 2.0 liters will be going into the upcoming 2013 Ford Taurus and other models, and now we're hearing that a 2.3-liter version of that same engine--with a different cylinder head configuration--will be going into the Mustang (it will also be used for Lincoln platforms) around 2015.

Ford is also working on a 2.7-liter turbocharged V-6, according to our source, and that engine will be used in both front-wheel and rear-wheel drive cars. That means it's a likely candidate for duty in the Mustang, the Edge crossover SUV, and perhaps the Fusion sedan. It's also possible that this engine could be used for a Ford Ranger replacement, should Ford choose to build one. Again, the target date here is 2015.

Fear not, V-8 fans, as the 5.0-liter Coyote that currently powers the Mustang GT does not appear to be going anywhere soon. However, it might receive direct-injection technology, which could improve fuel economy. A source indicates that Ford has also studied turbocharging its V-8s, but nothing has been approved for possible production.

A fleet of Mustangs offering three engines? That could be what Ford has on tap for 2015. Stay tuned.