So, in summary, we now know that:
1. You can't wall run anymore
2. Enemy AI wants to wall run, but can't
3. Based on what the PR guy said, you can no longer scale or hang on to walls using your mantis blades
4. You can't customize your vehicles
5. There are no subways, nor do you actually get to ride trains
6. Flathead can no longer be an AI companion, and you can't control it remotely either; its abilities are now a part of V's skill tree
7. Wardrobes can no longer be used to switch outfits; done via menus instead
8. Contrary to what was implied in the 2018 gameplay reveal, V won't get to own or switch between multiple apartments