User blog comment:Dtregle/Jason Todd in Young Justice/@comment-5154078-20120617232957

A lot could have happened in five years. There is currently a six-person gap in the numerical designations among the Team (B-10 through B-16), leaving the said teammates unaccounted for (though we can assume that one of these designations may have belonged to Tula/Aquagirl). Jason Todd could have already lived and died as Robin. Batman and Nightwing may possibly be staying silent about him out of respect.

The idea of Jason Todd showing up at some point in "Young Justice" still seems possible unless the writers finally decide to reveal on screen or in the tie-in comic that Tim Drake is in fact Dick Grayson's immediate successor as the Boy Wonder.

At this stage in the game, anything is possible.