In a Weekly Update Deej specifically highlighted the fact that The Taken King will include missions that are the exact same with different enemies swapped in to the mission.
They're bragging about making you play the same content over again.
Hell. They're not even hiding it now. They're kicking us in the nuts and telling us we'll like it. Then charging us $40 bucks to do it.
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I saw it said 3 old strikes getting ttk treatment, not missions.