http://www.maltastar.com/pages/msFullArt.asp?an=12221
It's not surprising that the latest treasure find by Odyssey Marine is shrouded in secrecy as it's not clear if they have enough artifacts to correctly identify the shipwreck (which many believe is the Merchant Royal).
When asked:
"There have been reports that the "Black Swan" is a number of different shipwrecks, including HMS Sussex and the Merchant Royal. Are any of these reports correct?"
Odyssey Marine issued the following response:
"We can confirm that the "Black Swan" is not HMS Sussex, and that the "Black Swan" was not found in waters anywhere near the shipwreck believed to be HMS Sussex. Beyond that, we cannot confirm the identity of the shipwreck because we are not certain ourselves. The site is in an area in which a number of Colonial-era Shipwrecks were believed to be lost. The "Black Swan" bears characteristics of one shipwreck in particular, but some of the evidence gathered to date is inconsistent with our research, so we want to be sure of the identity before we announce it."