There has been a lot of speculation for awhile now on Chris Jericho's WWE future and how long he will be a weekly part of WWE programming.
Metalinjection.com has information posted about the Rockstar Uproar music festival lineup, and it confirms that Jericho's band Fozzy will be on tour from August 15th to September 30th.
This year's WWE SummerSlam PPV is August 19th.
While this doesn't confirm if Jericho will still be active with WWE, the music tour schedule provided with the dates which can be seen here would certainly provide a lot of schedule conflicts for Jericho as an active wrestler.
Additionally, during a recent red carpet interview, Jericho himself indicated that he would not be around for this year's SummerSlam event.