Please understand this, and don't flame! You wanna know why I, personally, keep being reminded of how silent MOS has been since December 18'th of last year??? It's because every_day, there's new headlines on the hype's front page - and that's cool. It is. But every time it's constantly for every other movie coming out this year BUT "Man of Steel" :-( Pacific Rim, KickAss 2, The Lone Ranger, Word War Z & After Earth, are all going strong at it. Trailers, posters, featurettes. You name it. ALL of which are movies coming out long after MOS. In the mean time, the same handcuff picture of superman has been released multiple times through varies sources, claiming it to be "new stuff" (so tiring). Also, the listed running time of 2:28 hours (as seen on imdb.com) isn't even official. We don't know if anything of anything is true, or not. It's ALL speculation. Multiple people claims to have seen the film and comments on it. But when all comes down to it we don't even know weather or not it's true, any of it. We just don't know. ON TOP of that, there was no Superbowl tv-spot. There was NO panel at wonder-con promoting the new film. And that's even though Man of Steel IS Warner-Bros biggest film this year, and Superman has turned 50, etc. (seriously - W_T_F!?).
The above written are all factors of WHY "Man of Steel" seems completely dead in its marketing at this point in time. When it should be headlining all over those other films.
What you really need to understand is some facts as well.
1. WB bought ZERO ads for Superbowl 2013, as did Fox. Therefore, NO trailers for Pacific Rim, Wolverine, etc. WB also did not bother last year, with TDKR. As for all the other films hyped, most were released in March/April/May, the start of Summer movie season. MOS would not fit the category. Also, most of the film trailers were for films that NEEDED audience awareness - Oz, Lone Ranger.
Another reason would be that WB feels that the Superbowl would not fit the target audience they want for now. Case in point - the Superbowl was chosen to be the first glimpse of F&F6 - perfect audience and timing - marketing worked like a dream.... (WB DID release a Superbowl in 2003 - For Matrix Reloaded, out in May).
2. Why no MOS at Wondercon? Because it doesn't need it. IM3 wasn't at Wondercon either, because the target audience is already onboard. The films being marketed at WonderCon are those where the target audience is needed to get onboard. Pacific Rim NEEDS the gaming, Anime and scifi communities onboard. Same story with World War Z. Iron Man 1 and Green Lantern needed WC panels to get the support from their target audience, to establish the core fan base.
However, the December MOS trailer download numbers showed that both the core fanbase and general audience ARE aware of the film. There is NO point in WB promoting MOS at WonderCon - they've got the fans onboard.
3. Look at the marketing of MOS so far. A teaser trailer attached to one of the biggest films of 2012, used to ANNOUNCE the film. 2 posters designed to get attention. A 2nd trailer, attached to ANOTHER big 2012 film, which was one of the highest downloads. Now there are over 2 and a half months to go, with the marketing for the next stage. The next step is just promoting for the GA, and the date. That is 100% doable.