If you summon a ArmorStand with a head rotation set like {Head:[45f,0f,0f]}, it will work fine. But if you want to edit it with /entitydata or /tp command, it won't work. It's not a visual glitch because I quit and log back to the world and nothing happend...
EDIT:
Commands:
/entitydata @e[type=ArmorStand,r=3] {Pose:{Head:[45f,0f,0f]}} [WORK FINE]
/tp @e[type=ArmorStand,r=3] ~ ~ ~ ~ 45
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Please attach the exact commands used.

My bad, I miserably failed the command.
Correct command is /entitydata @e[type=ArmorStand,r=3] {Pose:{Head:[45f,0f,0f]}}
...
But the command /tp @e[type=ArmorStand,r=3] ~ ~ ~ ~ 45 still won't work and I don't now why...

edit: WAI like MC-65528, armor stands don't use their rotational data for rendering.