I should add that in Texas if I was using the you as a plural, talking to more than one person, I would say, "When are y'all coming back?" because the second person plural we use in the Southern part of the United States is "y'all".
2014년 12월 4일
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When are you coming back to Texas is perfect. It's what I would say living here in Texas. :D
2014년 12월 4일
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I think both "when are you coming back to Texas" and "when will you come back to Texas? are good.