I haven't found anything else on the ghost yet but on a mundane C1 level, I learned that some trees uproted by Katrina will be used to repair the ship in question.
"Last fall about 200 of the 2,000 Live oaks along the Coast in Biloxi, Pass Christian, Long Beach and Gulfport, which were uprooted by Hurricane Katrina, were pledged to the restoration effort of what's believed to be the world's last wooden whaling vessel. The 164-year-old Charles W. Morgan has been designated as a national historic landmark."
http://www.sunherald.com/mld/sunherald/news/state/14408780.htmI don't think there is any other info available. I can't get back to the original article, but this line was in a spin-off
"He (Laird) also received about 40 other reports of possible paranormal activity before those groups related their experiences. Museum officials gave the group permission to conduct the investigation."
So this wasn't the first set of reports, though it was a strong one. But maybe there are other possibly haunted ships all up and down the seacoast...