I figure Chemist would round out the gil-for-exp jobs. With a combination of job specific potions and maybe even some blm spell items that were common in single player FFs, the Chemist could be a pay-to-cast. We have a Pay-to-tank, pay-to-dd, and a pay-to-support, so this really is the last niche left, unless they split magery into white and black.

Geomancer is number one on most fanpick polls in both Japan and the west, so I can't see any reason why SE wouldn't include it. The world of FFXI is already massively intertwined with elemental affinities for everything.

Time Mage fits the premise of the new storyline. People say it'd be redundant with White and Red Mage, but Red Mage is already redundant with White and Black, and Summoner is largely redundant with White and Black, and all of the melees are redundant with one another. Who cares about being redundant? Time Mage could be a unique take on support jobs. Also, we have yet to have a mage with an A rank enhancing skill - a counterpart to Rdm. Hopefully SE wouldn't make "Time Magic" its own skill.