Marvel has already admitted to having no Avengers panel in Hall H this year. But, that doesn’t necessarily mean there won’t be any Avengers about.
The Hall H presentation last year was nerdgasm worthy but it was only seen by a few thousand. That is just not fitting for what
Marvel/Disney has planned for Earths mightiest heroes this year.
Early reports are claiming a Massive Viral marketing campaign that will encompass the entire show floor unlike anything SDCC has seen before. Shield will be on hand with vehicles, providing “security” and even a recruitment booth. Also, much like last year with Odin’s throne, set pieces of varying sizes will be on display. There is even a rumor of the helicarrier bridge set piece being on hand.
There is also word that various cast members from The Avengers will be lurking about as there availability allows. (They are still filming)
Speaking of film, There is a word of a first look teaser trailer!
Now filming is only a about two months in so it probably wont be very long or in depth.
There of course has been no confirmation from Marvel/Disney and it is unlikely they well confirm or deny anything before the show.