I'm going to get all hipster on you and mention that this trailer for the upcoming Lego Batman movie technically isn't the first Lego Batman movie. There's Lego Batman, Lego Batman: The Movie and like three Justice League spin off movies, most of which focus on Batman. The Lego Batman movie just happens to be a spin off of The Lego Movie and this first one to appear on the big screen.
Ok, now that I got that out of the way I can tell you about how pumped I am to see this. The Lego Movie was fantastic, I absolutely loved it and am still massively upset that Everything is Awesome wasn't nominated for an Academy Award. Batman wasn't necessarily my favorite character in the movie but I can't imagine them doing a Uni-Kitt/Benny team up movie anytime soon, so I'll take what I can get. Frankly I'm way more excited about watching this than I am Superman v Batman. Nothing I've seen in reviews or heard about it from friends has changed my mind about seeing that one. I'd rather see Zootopia or 10 Cloverfield Lane.