How will it work? I think some of the excitement for me is not knowing.

Will all items spiritbind at same rate?
Will the amount of SP needed to acheive 100% spiritbind > convert to materia be based on level or rarity or both?
Will HQ items spiritbind the same?

What do ya'll think ... we will know shortly, just curious what the speculation is. Also maybe I missed some news somewhere.