These things aren't on the same schedule as events, so it's hard to say. There's an interesting spreadsheet comparing features here: https://docs.google.com/spreadsheets/d/1C-o5TNjKjBPe7Y8s0fmqYkob4bfPKsnwfW_RETqPySU/edit#gid=0
Generally, it seems that it takes about a year to get here, unless it's tied to the story progression in which case it's two. My guess might be Q2 for the back button.
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