Originally Posted by
Jennestia
We don't have full details yet but it was stated jobs are more specialized and exclusive -- WHM for example will obviously be a better healer and have better healing abilities implementation in a party setting (the point of jobs) and a Paladin will likely be the go-to tank.
We know for example Marauder (18) and Gladiator (30) is required to Unlock Paladin which is placed ontop of Gladiator and exp you gain on Gladiator/Paladin goes to Gladiator/Paladin since they're basically one in the same in terms of growth.
When Jobs are released, Classes will be more for general use while Jobs will be for Party setting.