You better be careful what you say as we dont know if all of this stuff will actually make it into the game yet. Beyond that, the game will never look anything like the video that @fl0wf1r3 posted because the game would need to be developed from the ground up with every asset being created specifically for UE4. And just porting over assets that already exist is never going to get the same result. Car model poly count, textures, etc. all need to be created specifically for UE4 to get it to look as good as it could. Whether this happens is yet to be seen. I seem to recall the devs in some interview mentioning that working with UE4 was somewhat simple because you can plug in whatever physics engine you want with the UE4 graphics engine. So, Im not convinced they would use a whole new physics engine. Frankly, that doesnt make sense to me. You dont use the ISI motor source code dating back to ~2005 having developed your physics on it for the past 10 yrs only to scrap it entirely and start all over. Im sure they will implement the ISI engine physics in combination with the UE4 graphics engine.