This was discussed last spring.
All existing ’08 ships had to be reworked to operate in SSE. Some posed difficult problems because of their high-poly nature or, like the hovercraft, because they had special requirements not easily accommodated in the new sea model.
Titanic’s third-party creator, Jason, also wanted the opportunity to correct and enhance his model. So far as I know, the ball may still be in his court—beyond VSTEP’s control.
I don’t believe anyone at VSTEP ever went beyond a non-committal “will be back†concerning Titanic.