If it is, itll be farther down the line. A bungie dev said in a recent interview that those missions for those exotics took a bit of time to design. Four months to develop the whisper mission and seven for outbreak, so unless it was developed side by side with the outbreak, be expected to see another one like it between September and December.
I do relish the idea of a new mythoclast...
[spoiler]inb4 the mission Exotic is no land beyond[/spoiler]