Well , i think that the Spider man homecoming trailer is gonna be a full teaser , not like the sneak peek of Guardians . I bet that it will be online a week before Rogue One . In the case GotG Vol . 2 , Gunn said that they released the sneak peek to keep people calm because the trailer wasn ' t finished and its gonna be available soon . Technically its gonna be attached to Rogue One but I would expect an online release more sooner , there is a Brazilian expo next week and Gunn said that he is going to be there with Vol . 2 stuff so maybe we get the trailer during that time 14 december or during the week after , and another trailer for the superbowl . As for Ragnarok , yeah the trailer is going to be in time for GotG vol . 2 but maybe 12 weeks before , we might get some photos of the movie during empire or other sites coverage by the end of the year .