Subaru gave the next-generation, 2015 Legacy a brand new, more sophisticated platform and improved interior at the Chicago Auto Show, but the engines were carried over barely changed from the previous gen. However, if a rumor from Car and Driver turns out to be true, then the power trains may be getting upgraded as well.
A source within Subaru indicates that the aging 3.6-liter flat-six might finally be getting a replacement in favor of a smaller, more powerful six-cylinder engine, and the four-cylinder may get direct injection. Both of them would be ready for the new Legacy's mid-cycle refresh in about three years, and they would likely be shared by new Outback too.
The turbocharged, GT trim has been absent from the US-market Legacy for the last few model years, but the insider hinted that it might make a return in the coming years. The new version would use the 2.0-liter turbocharged flat-four found in the Forester and the WRX. Though like the Forester, a turbocharged Legacy would likely only be available with the CVT.