The WSOP is finally cracking down on idiocy at the tables. There is now a rule specifically prohibiting "excessive celebration," though personally I think that Hevad Kahn's antics were already punishable as a player conduct code violation. They are also rescinding the rule about "show one show both" after the hand is over - you now can flash a single card. Those rule changes and others are covered in a two part story on PokerNews.com.
Futhermore, the WSOP seems to be laying down the law early by ejecting the chip leader at the final table of a satellite event.
I fully support the efforts to squelch the over the top shenanigans at the table.