Metroid Database.com

FINALLY!! A scrap of info!! This comes straight from Ultra Game Players mag No.94, Feb 97, Page 21:
It reads:
"Metroid 64 Out By Fall In Japan?
"A Japanese source close to NCL hinted that Metroid 64 has been in development for nearly a year already and should be released in Japan sometime late in the fall of 1997. As expected, sources have indicated that the title is slated to be a 64DD title. The game is said to be extremely dark, and is likely to use an over-the-shoulder perspective similar to Mario 64. The premise of the game has been rumored to be that some of the Metroids have infested a new planet, and it is Samus' job to eradicate them just as she did in the first two games in the series (surprise, surprise)."

--TJ