Mounts are not a no but they aren't a priority because we will have a speed class. Even when/if we put them in, they will not move as fast as the speed class will but they will be very useful for carrying stuff around.
Source: KS Comments - April 09, 2013
However, I may also put in some features that some people might not consider fun (like true day/night cycle, slower and different leveling systems, extremely limited fast travel, no PvE leveling/gear grind) because I believe that will make this a better game for our niche.
Source: Foundation Principal 1