I have a gut feeling at release we will see at least 3 new jobs/classes:

Arcanist/SMN
Musketeer/???(Red mage or Chemist I think fit best)
Because with the addition of ACN and MSK each city state has 3 guilds.


And now SCH

And maybe even more.



I think the SCH guild is going to be one of two things:
1) In a new location somewhere.
2) Class requires you to jump between CNJ and THM guilds as you progress for the guild quests.

I think number 2 makes sense because SCH is traditionally WHM/BLM mix.

So in regards to the armoury chest only having 8 soul slots/25 slots I think they have built this into beta so that they don't give away the final number of new classes coming out at release.

Just my two cents