First off, WB officially debunked all the current casting rumors.
Second, since they don't even have a script, it's unlikely they'll be casting anything.
For the next year or so, I would not expect anything concrete to come out about the next Batman film. When stuff does begin to come out, it will be if it's happening and who is involve in the early creative stages.
Casting news on this crop of Batman films has always been late to the party. We did not know of Ledger or Eckhart until a few months before shooting.