Kenny Chesney's latest hit, "Ain't Back Yet," is featured at the end of his new concert film, Kenny Chesney: Summer in 3D.  The superstar says, "I think it defines and describes what the movie's about, what my journey's been about, to a "T." When Kenny moved from his East Tennessee hometown to Nashville back in 1991, he says his family expected he'd return home in a few years once the whole music thing didn't pan out.  "When I first heard this song, it reminded me a lot of a guy leaving East Tennessee with all of his stuff in the back of a truck, and I was gone chasin' my dream, and I'm not back yet." Kenny Chesney: Summer in 3D is now in theaters for a limited run.