The TV umpire can indicate a batsman is not out if the replays show there was
no contact between bat and ball when an appeal for caught behind is referred to
him - under the rules and regulations adopted for the upcoming cricket World
Cup. 
Among other interesting regulations for the March 13-April
28 event in the West Indies is the provision for moving the matches in
case of a dangerous pitch, to continue a match even under a drizzle in certain
situations, bowl-outs to break a tie result in semifinals and final, and vesting
the Match Referee with powers to suggest suspension of play citing security
concerns.
The relevant portion about the clause over clean catches states:
"The third umpire has to determine whether the batsman has been caught.
However, when reviewing TV replay(s) if it is clear to the third umpire that
the batsman did not hit the ball, he shall indicate that the batsman is not
out." So far, the third umpire has been called in only to indicate if the
catch had been taken cleanly.
Similarly, under earlier rules, umpires could only abandon a match if the wicket
became dangerous for play.
The ICC has introduced a five-stage system to break
a tie on points between two or more teams in the preliminary and Super 8 stages,
and a two-stage system for the semifinals and finals, including bowl-outs.
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