Marvel has one again announced that there will be an announcement forthcoming - in this case, making sure to tag its related to "Marvel Comics" and not another division. It's scheduled to happen Thursday, March 29 at at 12 p.m. Eastern time.
What could it be? The above graphic includes logos for Captain America, Black Panther, Captain Marvel, and Spider-Man.
Given the graphic is patterned after a TV test pattern, we would say it could be related to a television project - however Marvel clearly marked this as a comic project with the #MarvelComics hashtag.