Chris Jericho will likely miss the next two weeks worth of WWE Raw due to his band Fozzy touring Australia.
The official website of Fozzy shows multiple dates over the course of two weeks, with the last one taking place on Monday, March 4th in Perth, Australia. There is then a gap in their schedule that allows Jericho plenty of time to work WrestleMania 29 at Met Life Stadium.
The rumored plans, as of now, are for Chris Jericho to return following the tour and resume a program with current MITB contract holder, Dolph Ziggler. That feud is likely to culminate with a match at WrestleMania.
Of course, plans can always change between now and then.