Well Bethesda have posted a couple of teaser images on twitter citing an impending announcement. They also mention the fallout team is not working on this title.

Summary here
http://www.ausgamers.com/news/read/3302365/bethesda-teases-new-announcement-with-mysterious-pictures

My doom brain is jumping to conclusions - that first image being a portal to another dimension or hell itself - the shadowy figures of demons materialising..... Probably totally wrong but hey.....dreamers gotta dream

Hmph
New wolfenstein game

Why are you disappointed? We KNOW a new Doom is in development, this just means we'll get a (hopefully) kickass Wolfenstein game too from the guys at MachineGames. And come on, that trailer is class, light on actual gameplay etc but there's loads of time to show off that between now and release.

Ah I know - I'm not really disappointed. Actually happy. Just thought for a minute there that the Doom 4 silence was about to be broken. Haven't even looked at trailer yet. On the way home from work......

Yeah it's good news.

**

Just got in... Yeah trailer is nice. No gameplay. Jimi Hendrix can make anything super cool though. Looking forward to some gameplay.

id tech 5 I presume?