It should be "R" for sure. If it's not we'll end up with some campy hamfisted kiddy friendly CGI-fest like Ghost Rider. What a let down.
Make mine "R" please, gimme a film with a story and a dude with claws using them for the only reason that a dude with claws should have claws: slicing bad guys faces off and junk.
Seriously though, if it's not "R" it'll just be another lame attempt at taking a cool hardcore character and trying to turn him into a wussy kid friendly Spider-man type; just like they did with Daredevil, Elektra, Hulk and Ghost Rider. Look at the Crow, you can make an "R" rated comic book hero movie and still make boat loads of cash.
Remember Judge Dredd. The movie was all violent so they kept getting an "R" rating so they continued to pare it down and cut cool scenes until all it was was cheesy one liners and hammy Rob Schnieder mugs AND IT STILL GOT AN "R" RATING!!! And it sucked. As a result, since then all badass comic character's movies have been made all wussified in advance in hopes that they could stick a "PG-13" rating and most if not all of them were huge disappointments.