What new GMC car models will be introduced in 2013?

You're asking about car models released in 2013. It's important to note that the automotive industry is constantly evolving, and model years usually run from September to August.

Therefore, if you're looking for new GMC models that were introduced in 2013, we'd need to be specific about the exact time frame within that year.

To give you a more accurate answer, can you tell me:

* Which month in 2013 are you interested in?

* Are you looking for a specific type of vehicle? (e.g., truck, SUV, sedan)

Once I have this information, I can help you identify any new GMC models that were released around that time.