[rulesmaven]

Baseball's not my sport, so I'm a fanboy on this one.

Kind of curious what effect the new instant replay rule will have in MLB. What is the effect of an erroneous HR signal on a fair ball that is later overruled (either by the umpires during a conference or, now, after replay)? Is the BR or other runners at risk of being put out, is it a dead ball when the umpire signals HR, and what bases are awarded. (I'm thinking of a ball that remains in play.)