Not at all. All films take set pics and produce stills for use in promotional material. WB should already have them. All it takes to get them out there is one little press of a button, and whoosh they are on the MOS official FB or Twitter page. Piece of cake. Social networking does the rest.
It's also never been done by WB, because they want to keep MOS spoiler free.
Could WB release stills? Yes, of course.
But... Why?
MOS is 100% complete. Concept art of a finished film? No.
Concept art of films going into production? Maybe.
Could WB have released concept art for MOS when it started filming? Yes, but I'm glad they didn't.
Have another look at the concept art released by Marvel - 2 for CA2 (the least successful Marvel Universe film group), actual film stills from Thor 2 (showing.... Nothing), and lots of art for Ant Man and GOTG - without doubt, THE riskiest Marvel project yet. Audience awareness - zero.
If WB released concept art for MOS, will the GA pay attention? No, the hardcore fans will only. They've already got that audience aware, so why pander additionally to them now?
Just be bloody patient.
I'm gonna say this again. We have seen next to nothing of MOS, but people ARE aware of it. Are we as aware as STID, or IM3? No. But right now, we don't need to be.
I have had SO much of these 2 May films spoiled by December last year, that my interest has dropped. With 1 month to go, how many more scenes are gonna be spoiled? Odds are I'll know almost the entire plot before either movie is released. Talk about blowing your load...
WHY would you want MOS to have the same approach???