I was extremely disappointing at the lack of Henry Cavill, but I still loved it all the same. The lack of Henry/Superman (apart from distance shots) made me realise something. This trailer seems extremely dark, yes, but that's because it's Batman's viewpoint and so it not a true representation of what the film will be. The character we saw the most of was Batman, and the voiceover was Alfred. I'm hoping that there will be a trailer from Superman's point of view at sometime, balancing out that this is a 'vs'. One on either side ...
But, I'm also hoping that they end it as allies ... in fact, I think it will be earlier on than just 'at the end'. They will have to team up for a (hopefully) significant amount of time.