From what I saw in that awful trailer that's what they're doing.
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the 2nd job is called Rune Fencer.
>implying FFXIV's Arcanist works anything like Rune Fencer
>implying the FFXI team and the FFXIV team are the same team
>implying the FFXIV team has the budget and staffing to crank out content at the same rate as the XI team
>implying creating a new class and abilities and gear and lore, then balancing said class and abilities and gear and lore isn't the hardest single thing for a dev team to do