Yeah - Tesla software has two parts, a vision system and a driving system. The vision system turns the camera image into a description of what is in the image (road, cars, people, etc), and the driving system actually controls the car based on the vision input and route it has been given.

Up until now the driving part had been hand coded in C++, but now it is a neural net that has learnt what would a human do in similar road situation (not sure what they trained it on). Is this an improvement? Who knows - should certainly be different. This doesn't mean the car suddenly got smart and now understands what it is looking at - it just means it's using a different set of rules for when to switch lanes, brake, etc.