Based on what I have seen so far I really am expecting a few "catches" for Materia.

Catch 1- Materia will be housed in the main inventory,aka inventory nightmare resulting in 90% of the Materia i produce being thrown away/vendored, just as i do now with craft grind items.

Catch 2- Items will continue to be displayed in market searches (ward searches) without any of the details( hq rank, Materia enhancements).

I really hope neither of these are the case but just based on what I have seen in past "features" I have come to expect catches to any new feature. This isn't meant to come across as bitching, its just observing past features. I for one am super excited to see the new Materia system, classes, and new dungeon/zones.