Character Slot and Inventory question.

I had a few questions I wanted to ask:

1) Would free character slots be given in the foreseeable future other than when a new class comes out? Free character slots are given with Cygnus Knights, Aran and Evan. Dual Blade does NOT give you a slot.

2) If I were to buy a character slot, would I get a free slot if a new class were to come out (like Aran and KoC)? Yes.

3) How difficult is it being a DK? If I get more slots, I'm thinking of making one for kicks. Depends on how you like warriors I suppose.

4) When do the inventory slots of KoCs increase and which ones when they do? I'm currently using my DW (73) as a mule and I wanted to know. I don't think they expand.

Thanks

Answers in bold.