Over at IMPAwards the IMP mentions that this poster just shows us that the film stars the same people that starred in Titanic, which he muses might just be enough. And indeed I think the the new encounter of this two will be central to the marketing.
The funny thing is, Leonardo and Kate really aren’t looking quite like themselves in the poster, are they? No big effort to use a photo that facilitated their recognition either. Not sure I would have known who they were if their names didn’t show up in the poster.
As for the design, well, it’s nothing terribly original, but I have a soft spot for posters with lots of white and a single and serene strip with an image from the movie. For example, I also liked this poster.