Is it really just structural modifications?

Well, why am I starting this.. there's pretty exciting news rolling around about the changes in the new F1 championship. Trying to find an ad/commercial that's been showing in my local tv but still didn't find it online. From what I can remember, wings and tires are going to be wider, weight increasing by 20+kg (only 5kg being fuel)... so car must be quite a bit more powerful, grip stronger so MUCH higher speeds and increased chance of driver mistakes. Plus: not that much more fuel, so driver's competition would apparently increase a lot. 

Then the "kids" come in public and say this:
"2017 cars is like going from GP2 to F1."

http://www.roadandtrack.com/motorsports/news/a32703/sergio-p...