Well, potentially in the works.
Deadline is reporting that James Mangold and Hugh Jackman are planning a spin-off to The Wolverine and that Mangold is already in talks with 20th Century Fox to return. The Wolverine used the character's most popular solo arc, which would be him in Japan, so there is no telling which arc could be next on the list. There is 39-years worth of Wolverine stories so who knows what could be next. It is also possible that a new story could be created. The other question is, would this new Wolverine movie be centered around and/or after X-Men: Days of Future Past?
Moving forward shouldn't be difficult for 20th Century Fox seeing as The Wolverine brought in $413 million in the box office this summer. Not to mention the fact that Wolverine seems to be the backbone of every X-Men movie to date, minus First Class. Hugh Jackman seems to be content with his typecasting as well and has stated he has no plans to retire from the character at the current moment.
So, with X-Men: Days of Future Past hitting in 2014 and Fantastic Four hitting in 2015, could we see a new Wolverine by 2016? It is very possible.
I'm all for another Wolverine movie. I enjoyed The Wolverine and I am curious to see how they are going to move forward with the ending they gave us. Bring it!