Ok, prediction time. I am most likely going to be completely off here but I'm going to take a gander and see if I'm correct. I'm basing this on the Scourage thing I saw get socketed into the inventory. I brought up a few pages back talking about TOCS3 and how it does Master Quartz and how I thought this would be a cool idea for poe. So I'm gonna explain really basic how it works and we'll see if I'm right in my prediction. Probably not. LOL. But I'm gonna try.
This is a Master Quartz from TOCS 3
Each Master Quartz is based on an element, and gives 3 things: 1. Abilities, 2. Spells, 3. Stats. These are not all unlocked at level 1, in fact it's pretty basic at level 1. As you level it up more though things start unlocking more, and earlier abilities get stronger (eg: the break damage in this example starts at 50% and ends at 200%).
So my prediction for Path of Exile?
You will get these things that drop. I don't think they will be elemental centric but they will convey bonuses to your character either through stats, or keystones, etc. They can be equipped, unequipped, and tradeable. I think they will offer something unique too, that hasnt been seen before stat or ability wise. I think prefix will be stats, suffix would be abilities, and implicit might be something extra special.
I think it will be leveled up in an unconventional way or have different requirements (eg: complete 10 breachstones), and upon being max exp can be used to take you to another domain that is based on its ilvl and level and type of item. Upon completing this other domain, it will gain a level and get stronger and then the process repeats. Each one that drops would be different, convey different bonuses, and some of them you might not even know what they convey until you level them up a bit.