I was hoping to see some new source of t5 DoH materia, but looks like we're out of luck according to the patch notes.

What are the existing sources of t5 and tips for generating them?

Transmutation-> need to have lots of other tier five of other types and hope for the best?
Spirit bond crafted i170 gear (made with favor mats and all)

Maybe if we're lucky via the Mhachi Materia weekly (but I wouldn't be surprised if its DoW/DoM only)
Maybe via the new airhsip islands

Is that it?