I'm leaning more towards speculation, since he's not saying anything that anyone wouldn't speculate about given everything we know about this movie and this version of Batman so far, but Man of Steel Fan Page points out that Daniel Alter, owner of the tweet below, is actually a producer who has ties to Warner Bros. So could his words hold more water? You decide.

Can't wait for #BatmanvsSuperman.. #batfleck semi-retired/not speaking to Robin anymore.. Controlling drones from the batcave. — Daniel Alter (@DAlter007) November 15, 2013

Drones is the word everyone will latch onto here, and it certainly would be an interesting – not to mention topical – direction to take the character in. I'll let more knowledgeable and die-hard fans discuss the ramifications if this were to turn out to be true.