There was more that people gleaned from the scene. The lead guy was revealed in the (now-erased) summary to be the Night's King. The Night's King is referenced by Bran in the book. He was a former head of the Night's Watch who fell in love with an other/White Walker, married her and turned into a tyrannical Other. This was centuries ago. And as a human he was a Stark. So people are saying that the ending of the episode revealed who would be the ultimate "big baddie" whereas in the book it's not been revealed he is even alive, let alone running the Others/White Walkers. And it brings up what it means for the Starks, who have always been the purported heroes of the story, as much as there are heroes in Westeros, if the main villain turns out to have once been one of them.
Personally, I didn't even remember the Night's King story so I'm not sure how I feel about his continued existence being revealed in the show first versus in the books. I always thought that the ending would involve the Others vs Westeros (rather than infighting amongst the Westerosi, as it is now) and I guess this would suggest that is the direction it is going to go in. Ice (Snow) is going to join Fire (Dany/dragons) and go to town on the Others is my guess