Moving will be made to interrupt spellcasting at a point in time...

[ApplePie]

but we have to think of the poor paladin in the PvP situation.
if we can run with the same speed while casting, he will have a horrible disadvantage.
in a year, when PvP actually could be in the game.

Yeah, cause in a year, this game will have 10mil+ subscribers, so we have to push aside the current paying population to appease to those mystical future players.