Seth Rollins will be making a big announcement on Monday, but it won’t take place on Raw, Rollins announcement will take place on Sports Center. While there is no official word yet on the nature of this announcement, the backstage speculation is that it won’t be related to any current storyline since it wont take place on Raw. 
It is said that Rollins will announce that he will be on the cover of the upcoming WWE 2K18 video game. Rollins has been rumored to be on the cover for a few weeks now. Below is the tweet sent out by wwe:

Tune into @espn to see @WWERollins‘ big announcement on @SportsCenter this Monday, 6/19, at 10:30 AM ET! pic.twitter.com/dhiMxqakB6
— WWE (@WWE) June 16, 2017