Data Holmes wrote:
Cameron made a off hand joke about it on the red carpet for Titantic which was taken out of context. Still he and Scott apparently talked about Prometheus, specifically toward VFX and 3D film.
The studio that handled the 3D conversion for Titanic
did some work on Prometheus
(some shots, only a couple, apparently turned out poorly enough that they needed some conversion work done), which I'd imagine was the source of their conversation.