of course someone will create a topic about this in game-play discussion forums after RoK release. The following will then happen :
First shamans and rangers will claim there is no precendence for bards being fastest.
Then lore lovers will inform us there is no lore telling us that bards are fastest.
Then, after about some months into RoK some Dev will suddenly /slap his forehead and explain:
"the Bards....We forgot about those bloody Bards again" and very quickly create a new upgrade for selo's.