Paramount Skipping Comic-Con, Too
In addition to Marvel Studios skipping out on Comic-Con, it's become known Paramount will not be hosting a panel in Hall H as well.
The reason cited, according to THR, is that the studios decided the timing isn't right for them when it comes to their upcoming releases.
Regarding Paramount, they have no new Transformers movie currently in the works and Star Trek 3 is yet to kick off, though they could have done something for Teenage Mutant Ninja Turtles 2; however, it's still year out from the movie's release. Terminator: Genisys also opens a week prior to Comic-Con, and the next Mission Impossible opens July 31st; so Paramount could have at least had something, but chose not to.
The same goes for Marvel, as Marvel could easily have done something for Ant-Man, which opens a week following Comic-Con, and Captain America: Civil War is currently filming; Doctor Strange is also in the works. It is being speculated Disney may be holding Marvel out for its own big announcement event, similar to last October's Avengers: Infinity announcement.
While Marvel Studios and Paramount won't be there, Warner Bros. will be there on Saturday night with their Batman Vs. Superman and Justice League panel.
Disney has confirmed Star Wars for Friday, and Legendary and Fox Studios are expected to be there, with Sony putting up a Pride and Prejudice and Zombies panel through its Screen Gems label.
While Marvel Studios will not be attending, both Marvel Comics and Marvel TV (Agents Of SHIELD, Agent Carter) will be at the convention.
Comic-Con takes place July 8-12 in San Diego.