I think showing a US Navy ship charging through some waves would attract the same level of people (I would rather see something new than an updated version of a ship which has been in since 2006)
Besides, this is Extremes...
Some blog on the E3 website thinks Titanic's inclusion is some kind of rumor
I think it would be best to put those "rumors" to rest for the world to see.
Who knows, maybe they could have a trailer opening with navy ships, Green Peace ships, and so on, then have a few second tease of the Titanic steaming along
That should ensure a maximum attractiveness to newcomers