promotional teaser page is up. Batman vs Superman: Dawn of Justice is the title we are given.
The teaser page doesn't have much going on other than the official logo. Taking a look at the page source, the keywords set up for the site show the actors that are returning for the film - Henry Cavill, Ben Affleck, Amy Adams, Laurence Fishburne, Diane Lane, Gal Gadot, Jesse Eisenberg, Jeremy Irons, Holly Hunter.
I am noticing that there is NO mention of any other Justice League members currently in the keyword listings in the source for the page. This tells me that this film will be focusing greatly on Batman and Superman. Wonder Woman is mentioned, as is Gal Gadot's name, so she will have at the least a cameo to tie them all together for a future Justice League film.
Amusingly, the official Facebook page for the film has been seeing a little bit of a backlash from some fans. Fans complaining, and perhaps very rightly so, that this is a Man of Steel sequel, NOT a Batman film. However, from Warner Bros. position, putting Batman as top billing would perhaps indicate the idea of using a character with a LOT of recent theatrical pull in the form of Batman makes more sense. Man of Steel had a lot of mixed reactions when released, and Superman has always been a very tough character to sell in theaters over the years beyond the 70's Christopher Reeves movies.