Four Legged Run

[Centaur]

They do, actually. There are several different movement speeds. Outside of combat, you have:
* run speed (with weapons sheathed)
* standard walking speed (with weapons unsheathed)
* slow walking speed (with weapons sheathed; promised by the devs, but I haven't seen that in gameplay videos yet)

In combat, you have:
* standard walking speed (with weapons unsheathed)
* power walking speed (with weapons sheathed)

[Armory]

Very interesting!

[Centaur]

This quote from a recent interview may be of interest as well:

GW2O: Will there be the possibility to customize the posture of the Charr in the character creation, being able to make them straighter or more curved?

Eric: The posture of the charr is not something that we are able to change.