If someone tries to tell you there's going to be a secret Game of Thrones episode in February, tell them to relax; it's only a look behind the lens. There should (theoretically) be no dragons present.
On February 8th, HBO will air a behind the scenes special called "Game of Thrones: a Day in the Life." The half-hour special will take you through a single day of filming season five on three different sets in Ireland, Croatia, and Spain. The special will highlight the cast, sets, and production, but should give us a glimpse of what's coming later this spring in season five.