The clip – released over the weekend – even teases that Hudgens' character Gabriella and Efron's Troy may split (though Hudgens has said Efron, real-life beau "always makes me happy.")
(See photos of couples who hooked up while working together.)
"I'm a lot better at saying goodbye than you," Gabriella says.
"Why are you saying goodbye?" Troy asks while Gabriella plays with his hair.
HSM3 is expected to be the last for the flick's original stars.
"[HSM: The College Years is] not for us," Hudgens has said. "We're pretty much done, I think."
The Disney flick hits theaters Oct. 24. Its soundtrack, which features 10 new songs, will be in stores on Oct. 21.
(Check out photos of teen stars then and now.)
Tell Us: Would you be disappointed if Troy & Gabriella split?
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Despite Hollywood pressures, Zac Efron and Vanessa Hudgens have made their relationship work so far. Do you think they will last as a couple?
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