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Fox has released the first poster for Fantastic 4 that shows the characters, albeit from the back (it released an earlier poster, along with the first trailer, that just showed the logo, see "First 'Fantastic Four' Trailer & Poster"). 

Fox’s marketing team for this film has its work cut out for it, with Marvel’s Avengers: Age of Ultron premiering in May (see "Best in Shows--Q2 2015") and Ant-Man on July 17, just three weeks before Fantastic 4’s August 7 premiere date (see "Best in Shows--Q3 2015").  And, of course, there’s this little thing called Star Wars bracketing the year in December.