We open it up to find…

…a grumpy face?

It's a familiar face, though it seems to be missing some teeth. There is definitely a battery design change, specifically the migration of two battery cells off of the trackpad. We will examine this more later, but it appears that the trackpad will be a little easier to replace this time around.

Grumpy kitten glares back at the grumpy-faced MacBook Pro Retina, likely reminiscing on Retina displays past.