They are about one week into the sonar scan, and assuming they started where they think the plane most likely impacted, that would be an area scanned of 3,000 - 4,000 sq km. Unless Jeff has heard unpublished news that they have found, or think they have found, parts of the plane, a negative scan result would be disappointing. There was a report in the French press late last week that the search area had been localized (if I translated correctly), but without being more specific, and a 16,000 sq km area could be localized in the larger order of things.
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I think this is the video mentioned by wes wall.
France 24 | Investigators piece together wreckage from doomed Air France jet | France 24
There is an English voiceover on several remarks spoken en Francais, but one of the investigators apparently said there are burn marks on parts of the wreckage.