This is very good news. Some people were concerned that MGM would push for a more teen-friendly PG-13 rating for this "re-imagining instead of an R rating that would be more in line with the original film directed by Paul Vorhoeven from way back in 1987.
As a matter of fact the original was so violent that it had to be trimmed down to acheive its R rating because the MPAA gave the first cut of the film an X rating.
Producer Mike Medavoy had this to say about the film:
"Well I was involved with the original 'Robocop,' and it was an R, and the likelihood is that this will be an R. It's likely to be an R unless the director cuts back on some of it."
Based on Aronofsky's previous work it's not likely he'll be going for a PG-13 rating.
The new Robocop film is not a sequel, so I guess we can stop calling it Robocop 4. Instead of "remake" or "reboot" Medavoy prefers the currently chic "reimagining." It will not be tied to anything that has come before in the series, so it will be the Batman Begins of the Robocop movie franchise.
Rumors of the film being shot as a 3D feature were also shot down.
Robocop is set to open some time in 2010.