As far as we know Guided Arrow is definitely not going to Pierce anymore, since that came in with a bug in v1.09, and is quite overpowered, especially for boss killing and PvP. Remember, just because your character enjoys and exploits an overpowered skill doesn´t mean it won´t be changed. ; )
source diabloii.net
en gros ses rendu officiel que les amazones pouront plus combiner piercing et guided arrow de facon a faire frapper 5 fois la meme cible par une fleche.
en plus (pas encore officiel) le slow target va etre enlever des duels probablement