It is unlikely for the new job to run off an existing class. Classes, being a remnant of the failed 1.0 launch, are slated to be phased out either in the 5.0 or 6.0 expansions (we are currently on 4.0). Yoshi-P has also voiced that while he thinks SCH was a success, linking it to the ACN and SMN was a mistake. That said, this was a couple years ago, so he might have changed his mind. That said, we might see similar abilities, such as how RDM has verfire and verstone, which are comparable to BLM and WHM's versions of hte spell.