Regardless of who wins I think there should be some commemorative weapons or at least a really good achievement for the all the factions.
This is based on legion winning.
(just swap the legion for exile and vice-versa)
Personally I think the reward should be:
An achievement (That looks like the "Dark Matter Generator")
Worth: 7'000 + (legions "war hero points" - Exiles "war hero points")
A "frost-card" much like the "11/11/11" that increases the the chance to get the bonus effect of the "special event weapons".
And there should be "special event weapons" that have a chance to cause "event based special attacks" and can be purchased by anyone. (even by the side that didn't win)
Primary
I think that the primary should have 10% (15% if you have the "frost-card") chance to cause "bomb drop" that causes more damage then the standard hit.
(the "bomb drop" would looks like the small one in the design notes, it would land by the opponent and explode)
Sidearm
I think that this could have 5% (7% if you get the card) chance to cause "Bullet blizzard" that causes extra damage against one opponent or normal damage against two.
("Bullet blizzard" would look like it normal does firing but shoots twice instead of once)
Aux
I think this should have a 5% (7% if you get the "frost-card") of causing "snow bowler" that has a 50-50 chance of stunning the enemy if it doesn't stun them then it causes slightly more damage.
("snow bowler" could look like a ball of ice rather then the snowball it normally would)
Armour
Could have a special "de-buff" effect that reduces your opponents "special weapon" effects chance by 1-2 (2-3 if you have the "frost-card")
robot / vehicle
I think that these to should be combined, my idea would be to have a "mutagen item" that causes the "baby yeti to "evolve" into its adult form and changing its special to "maul".
"Maul" would look like the bounty hunters massacre and cause 150% normal damage(in total), seeing as it wont remove the ranged weapons, but unlike massacre it can be blocked.
Also I it would be able to be ridden on like a bike seeing as they already said something about "beast riding".
these are just some idea but it would be nice if one or two of them where used don't you think.
PS the reason i haven't put the weapons base damage, stats modifiers or amount of enhancement is that I'm not that good at balancing them that way.