Press release says Cavill, Adams, Lane and Fishburne are confirmed to return and that a new Batman will be cast. Here's
the logo they showed at Comic-Con.
According to io9 Harry Lennix joined Snyder onstage for the annoucement and read the following dialogue:
I want you to remember, Clark… in all the years to come… in your most private moments… I want you to remember… my hand… at your throat… I want… you to remember… the one man who beat you.
It's from The Dark Knight Returns
. Snyder said the movie won't be an adaptation of it, but it'll be inspired by it.