I always thought the Society frowned upon the use of Pinatas, if not discouraging the use of them all together.
Apparently the WTS has decided to avoid insulting the brothers in Mexico.
From the September 22, 2003 Awake. (If anyone can bring up a scan, please do so)
"When considering whether to include a pinata at a social gathering, Christians should be sensitive to the consciences of others.(1 Corinthians 10:31-33) A main concern is not what the practice meant hundreds of years ago, but how it is viewed today in your area. Understandably, opinions may vary from one place to another. Hence, it is wise to avoid turning such matters into big issues. The Bible says: "Let each one keep seeking not his own advantage, but that of the other person"---- 1 Corinthians 10:24.
Also see: http://www.jehovahs-witness.com/12/50550/1.ashx
Comments anyone?
P.S. Thanks to Shotgun for the tip