Here’s a video showing everything iD worked on related to what was referred to as “DOOM 4” from like 2007 to 2013 before scrapping a huge part of it and coming out with the critically acclaimed 2016 version (which was only shown starting around 2015 at QuakeCon and E3).

Note that not EVERYTHING was scrapped, as you can see things like the super-shotgun model are close to the final release - as well as what you can tell were early slower iterations of the execution-style animations the game became famous for doing, but a lot of what is shown in that trailer was never to be seen again outside of these old videos people have attempted to archive.