As far as I know the manga was way before the original anime.
The manga of Sailor Moon began it's run in 1991, the anime series started in 1992 - so not that long. Infact, the manga and anime were probably simultaneous near the end (around SM Stars period).
Hopefully the anime will have a new story, more akin to the SNES game, Bishoujo Senshi Sailor Moon: Another Story
where past, present and future get mixed up and Sailor Moon has to save the day.
Or maybe it will be a twist on one of the Sailor Moon Arcs. I enjoyed Pretty Guardian Sailor Moon because it eventually came into it's own. [spoiler]Dark Mercury[/spoiler] improved the character of Sailor Mercury!
I also hope for some more Outer Senshi action and general dark plotlines with some dosage of angst. It's probably why S is my favourite season.