So In live letter they said, Materia Melding

It will not be possible to use advanced materia melding for STR, DEX, VIT, INT, MND, and PIE. You will be able to meld these stats into available materia slots.". So do u assume as I do, that each piece of gear will have 1 available materia slot. And that you could overmeld say spell speed, or det....etc? Just wanna know what u guys think.