What's the obsession with movie ratings? Don't think I have looked at a movie and thought, oh I wonder what the rating is!. So what if it's a PG/12/15, you can still get a good horror/thriller movie about werewolves. It's not all gore and violence.
People like to complain about what are often imagined problems.
The fact that you can get away with a lot more in some ways these days seems to pass people by, for example IIRC Mad Max was originally an 18 with some heavy cuts, then 18 with fewer cuts, not it's an uncut 15.
The BBFC ratings in the UK have trended down even for existing works as they've become more liberal (I know, on this forum that's a dirty word for some!) in what is allowed, despite some people thinking that things are getting more restrictive.
When it comes to proper horror films the production companies are still quite happy for a 15 or 18 rating especially the marketing departments*, unlike "family" films where they'll push to get it at a level that will allow as many kids as possible to see it.
Given this is a horror, I'd imagine they'll be aiming for a 15 or 18.
Also for those that are worrying about the cert for the original film compared to whatever this one gets, it was a 15 (the extras on the disk pushed it up to 18 for at least one release), so if the new film gets an 18 it'll actually have been deemed more gory/violent than the original
*Many would much prefer an 18 as it appeals to certain groups who'll go an see even the most rubbish film if it's got an 18.