^Well it's all optional stuff as they stressed. I didn't hear anything about the skills system at all during the conference, just a brief snippet of character generation where they alloted their SPECIAL. I'm very excited about the idea of gun customization and the completely reworked crafting system sounds pretty cool. It sounds like stuff tooled for certain playstyles, but it's something everyone can do. I imagine the focus is still on different guns on different skills, so you're not gonna be able to go through the game using pistols, then switch to an automatic plasma rifle and be a god with it.
Doom just looked cool, even if the music sounded like ass (seriously, it sounded like bit crushed, slowed down renditions of the 32x version's soundtrack), Hell in particular looked right out of a heavy metal album which I absolutely approve of. It looks like they're taking everything that worked with Doom 3, making it even better, and throwing out all the stuff that didn't work and going back to the drawing board on it.