UPDATE: We've finally tracked down the Ubisoft representative, who misunderstood our question about the game's support of 1080p. He apologized for the confusion, noting that the game currently supports only 1080i.

Nonetheless, we're still trying to track down the reason for the pre-release review build of Splinter Cell: Double Agent enabling 1080p support on our debug Xbox 360. We expect further updates on this story soon; the original story remains intact below, but is no longer representative of the situation.

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Our first clue was that the pre-release version of Tom Clancy's Splinter Cell: Double Agent, which installs to the Xbox 360 debug hard drive, contained an option for 1080p support. The option was buried under the system options in the console Dashboard -- easily overlooked.

Once we noticed the new option, we immediately followed up with Ubisoft. Would the retail version of Splinter Cell: Double Agent also support 1080p output on the retail Xbox 360?

A Ubisoft representative's answer was short and to the point: "Yes."

UPDATE: No word yet on whether it's an update on the game disc or a forthcoming Xbox Live download, but Ubisoft has confirmed 1080p support to us.

Source