Seeing as how Nomura drew this and Yoshi-p was specifically "Ah but we don't have someone who uses hammers!" makes me feel that this is going to be our Geomancer.

They screen this stuff far in advance and for them to secure Nomura, have him draw this character, then overlook the fact we don't have a hammer user job? Seems super fishy.

I'm betting it'll be our segway into a job like Geomancer possibly for 6.0 or maybe even cramming it in like Ninja potentially at the end of the expac.