OK. Well this is pretty much at the top of my wishlist right now and for good, gore-infested reasons. DOOM returning to it's roots of being a run and gun blood-fest.
Please watch this trailer from Bethesda/id Software at your own discretion.
The only minor downside thus far? No out-of-the-box co-op. There will be an extensive level creator however which can be made to cater for co-op play - so there is hope yet, especially with the fast-paced multiplayer that will no doubt keep players hooked for many a late night.
This video and more available on Bethesda Softworks YouTube page. (LINKED)