There was no discussion to split the articles in the first place. Also, Mercedes-Benz has not yet announced a new CLC-Class and Wikipedia is not a crystal ball or an outlet for original research. The "new" CLC-Class if that what is turns out to be named is said to be quite a different model—a front-wheel drive coupe-esque sedan based on the B-Class platform. The previous model was simply a three-door C-Class with different front-end styling, even sharing the 203 series model code with its sedan donor model.

Please see, Wikipedia talk:WikiProject Automobiles#Merger of Mercedes-Benz CLC-Class to Mercedes-Benz C-Class.  (talk • contributions)