I think that is why this "face lift" is a mild tweaking just so 2017 sales can say something on the order of "new for this year yadda yadda". Now if they go with all LED lighting then the headlights will certainly look different.
Similar to what @circoloco is saying, I read that the changes will be basically the same as the ones for the A-Class facelift. The CLA and CLA Shooting Brake have been spotted with minimal camoufalge as well.
The interior of the GLA will get an updated 8-inch infotainment system with support for Android Auto and Apple CarPlay as well. Galvanized switched will be introduced and there will be some minor changes to the instrument cluster.
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