As of 01/28/13, Serenity Ace is off the coast of Mauritania (Africa) and still heading south to Ghana.
My SA built 2013 335i xDrive sedan was on the same Serenity Ace voyage 35A - loaded on board 12/22/12.
The last update from my CA still shows 'Serenity Ace' but the arrival date has been delayed until 2/22/13. At least your CA update and my CA update are consistent - showing the same vessel.
Since my vehicle is heading to US-West Coast and your vehicle is heading to US-East Coast, it's just highly improbable for our vehicles to be on Serenity Ace.
It's puzzling why a new vessel name is not provided for vehicles transferred from one vessel to another.