Let's say you've been itching for a plug-in hybrid BMW, but the i3 SUV isn't your style and the i8 is a bit too sporty. Well, maybe your patience will pay off as the automaker's recently announced that the platform powering the aforementioned rides will make its way to the "core-brand models." This starts with a 3-series eDrive prototype debuting in Miramas, France. What's under the hood? a TwinPower Turbo four-cylinder that's based directly off the power-plants of the i3 and i8, as noticed by Autoblog. BMW says that its plug-in hybrid tech is flexible enough that it can go into basically any of its vehicles and that the implementation can happen pretty quickly, too. If you're curious as to what it all looks like, we've embedded an official mock-up image after the break.