Don't forget, they're are TWO sections left to open. The Princess Meet and Greet is listed of LATE-2013, and scheduled to open first. The mine car ride has always been slated for 2014. As PP said, recently its been said "Spring 2014". Because of the M&G is first, I seriously doubt you will see it open in 2013. The date right now is too far out to really target, but likely they will either want it open for Spring Break (Easter is April 20th in 2014) or shortly after for the summer season.
Therefore, the most likely official opening will be April or May 2014. A single ride will usually soft open a couple of weeks before official opening, but not a couple of months. SO, I would predict at this stage I would NOT expect the ride to be available February 2014.
However, with over a year to go, the schedule could be flexible by months either way, so its not impossible it could be open.
My call: Assume it won't be. If it is absolutely critical to you, don't book your trip until the date is firmer. They'll probably be narrowing it down pretty tight by next August at D23 convention.