Just a thought - I understand why basically nothing is being said about Doom 4, especially given recent developments which have come to light. And I understand that's kind of id's way of doing things, especially after Doom 3 was built up for so long.
That said though, I gotta say, I just don't have the same level of enthusiasm for Doom 4 that I did for Doom 3. And it's not that Doom 3 ruined my expectations - sure it wasn't perfect, it had its flaws, but I loved it and enjoyed the hell out of it (and, continuing my notorious tradition of buying multiple copies of a Doom game, I also bought the BFG edition). I just don't care as much. Part of it is that the technology could never hope to make the jump the way Doom 3's technology did. We all remember the first screenshots and videos - it looked utterly amazing, it was something that had never been done before. I don't think if screenshots of Doom 4 were released, we'd feel that same way, at least from a technological perspective.
However, another factor, I think, is that we know virtually nothing about Doom 4. Again, given the situation, that makes sense, but even without that, I think id has made it pretty clear that they won't give away much of anything until it's pretty much done. Thing is, I kind of miss that feeling of seeing a new screenshot and getting all excited over it. It was years of waiting, yes, but it was thrilling. I'd try to imagine what it'd be like to play Doom 3. I'd have dreams about it. It all made me want the game so desperately the moment it hit the stores, and few games have that effect on me.
Yeah, hype can be a problem, because it creates expectations which can never hope to be fulfilled, and of course, giving away information too soon can be very bad if things change over the course of development. And of course, we all know what happened with that gold-plated turd knowns as DNF (wait, sorry, that wasn't even gold-plated, they just spraypainted it yellow, threw some glitter on it, and called it gold), but I dunno, I just think it's a bad idea to have a much-anticipated game in development for years and not give fans a reason to be excited.