[friendcomputer]

From TFA:

"Working with funding from the Yale Provost’s office, Cowen and post doctoral researcher Brice Kuhl, now an assistant professor at New York University, showed six subjects 300 different “training” faces while undergoing fMRI scans. They used the data to create a sort of statistical library of how those brains responded to individual faces. They then showed the six subjects new sets of faces while they were undergoing scans. Taking that fMRI data alone, researchers used their statistical library to reconstruct the faces their subjects were viewing."

So yes, it will always output something like a face. It's more like they are using the FMRI to select among preset options. It's still potentially a great result, but we need more detail than this article provides.