There is an excellent post at Pwnwear about raid buffs and debuffs on the PTR at present. The key facts for warriors are
1) Battle shout changed - this is now +str and +agi instead of +AP. It shares stats with shaman totems and the DK ability horn of winter.
2) Commanding shout changed - this now adds stamina, and shares stats with the priest spell Power Word:Fortitude and the warlock imp.
The effect of this is that if you run with a priest in your raid there is no need to buff commanding shout at all, except perhaps after a combat rez. If you raid with a DK then given the short duration of horn of winter, it's possible that the buff will fall off during the fight if the DK is not paying attention. Since shouts give rage now (20 rage I think) then using battle shout from time to time should ensure that the buff stays up and should give you some extra rage.