in the previous snapshots, the f3 menu displayed the direction you were facing with coordinates. it would display either positive or negative x or z. They removed it for some reason
MC-53818
f3 menu no longer displays the coordinate the player is facing
Resolved
Duplicate
0
Apperently, they added a fancy new "crosshair" which shows all directions at once.
Edit: "The crosshair displays 3 short colored lines to indicate the direction of each axis: x/red, y/green, z/blue"
http://minecraft.gamepedia.com/1.8#Changes