Cameron has previously announced his plans for four additional sequels to his 2009 hit film Avatar, which will be released between 2020 and 2025.
Winslet previously portrayed the wealthy Rose Dewitt Bukater in the iconic Titanic alongside her longtime friend, Leonardo DiCaprio.
Winslet recently opened up yet again about their friendship on ITV’s Lorraine, saying, "Luckily, and this is the fortunate thing, we never fancied each other. I know that's really annoying to hear, sorry, but we really never did."