The curiosity about the succession plan at Warner Bros. followed studio prexy Alan Horn all the way to Cambridge, Mass., Wednesday as the exec addressed a group of Harvard Business School students at his alma mater.

During the sesh with about 80 grad students, Horn was asked what he planned to do now that his “retirement” from the studio had been set for next year. Horn noted that his employment contract runs through the end of 2011 but emphasized that he hasn’t made any decision about his long-term future.

There’s increasing speculation in the biz that Warner Bros. chairman-CEO Barry Meyer will stay with the studio beyond the end of his current contract, also up at the end of next year. Keeping Meyer, and possibly Horn, at the helm would at least temporarily ease the pressure on Time Warner CEO Jeffrey Bewkes to choose a new studio topper from the formidable bench of execswithin WB and Time Warner.

But Horn, who also attended Tuesday’s preem of Warners’ “The Town” at Fenway Park during his Beantown swing, didn’t give up any clues as to which way he’s leaning. He did offer the students some hypothetical situations that might interest him in the next chapter of his life, such as returning to producing films or working for a nonprofit environmental org.

All in all, the students came away from the chatfest impressed by the Hollywood vet.

“Great guest, very candid and admittedly very cool for a guy in his 60s,” tweeted one participant with the Twitter handle Fungaishon.

(Cynthia Littleton contributed to this report.)