I think there would be a good possibility that a two door coupe model might be for release in the future. I'd imagine Mercedes would keep an eye on the sales of the CLA first and then decide which direction they would want to go. And then if it does get released I can also see a AMG coupe model as well.
Personally, I don't like the looks of a coupe. I think the overall look goes better with the four door. and not to mention the practicality. The four door "coupe" would achieve more sales anyway. I wouldn't put my money on this one. Great to have options though.