As noted earlier, Chris Jericho finished up his current WWE run at last night's SmackDown tapings. Jericho will start touring with Fozzy again from early August through mid October, with a brief break from August 19th - September 12th.
While there is always a possibly that he can return in late October, a return in early 2014 seems more likely. The timing would coincide nicely with Jericho's plans to release his next book in February 2014.
You can get full results for this Friday's SmackDown, with details of Jericho's final WWE appearance of his current run, at this link.
As noted earlier, Jericho commented on leaving WWE, writing on his Twitter: