There's a free DLC item pack to download once you finish the prologue
I'm aware. Haven't bothered to download it, because why? On that note, all the equipment gotten by the demo and the preorder DLC is fucking stupid powerful compared to the other stuff you have access to at the beginning of the game. The challenge map that came with the preorder set is doubly devious: not only does it give you incredibly powerful armor for beating it, but it can be replayed, allowing you to theoretically grind up units. (not very FAR, mind, since the enemies in that map are like, level 2, but the experience you get from the map totally carries over.)
Methinks balance and difficulty are not priorities this game has.
On another note, I noticed in the Add-On Content menu there was an option to trigger Advanced and SP Advanced mode, the former of which is locked and requires game completion to unlock, and the latter of which requires to be bought. I read the description to SP Advanced mode closely, and in all honesty it seems like Advanced mode but easier, which seems to defeat the point, imo... unless it's actually a HARDER Advanced mode even WITH the bonuses...