AFAIK, Cameron is still busy finishing his Avatar sequels. Last I heard, he had other projects- not Aliens-related- lined up for when the Avatar series wrapped.
A year or two ago, Neil Blonkamp was tapped to helm an Alien 3 RETCON (see earlier in this thread) but that came to naught.
I think the closest we're going to get to a new post Alien-Aliens continuity movie is the comic book I referenced a few posts ago.
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