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The actor, who portrays the villainous Benjamin Linus in the series, had previously promised that the season ender would be "explosive", TV Guide reports.
Emerson spoke about whether the much-speculated appearance of Jacob would transpire during the two-hour episode.
He said: "There seems to be a suggestion that we're moving in that direction, but what Jacob might be or how he might be revealed, if he ever is, is one of the juicy surprises of future Lost work."
Emerson also said that his character is likely to be a prominent fixture in the highly-anticipated finale.
"Ben has sacrificed his leadership and authority [to Locke], but he's also going to be asked to serve someone else's interests, not his own," he added.
However, the actor remains unsure if he will be around for the final season of Lost.
Emerson explained: "Well, nothing that happens in the finale suggested to me that Ben's work was done. But like everyone else, he is vulnerable to accidents... or injury. I'm hopeful that I will be among the actors who appear in Episode 601, but nothing is written in stone at Lost."
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