From discord (translated by Hayenn):

Spirit of Darkness (Undead) Neutral - 5 star - Magic Damage

• General Attack: Throws a giant shuriken of darkness to attacks multiple enemies.

• Skill Attack: Attacks enemies with dark energy paralyzing and stunning them for a while.

• Special ability 1: 4% basic game speed

• Special ability 2: 3% movement speed and 4% attack range of undeads.

• Special ability 3: Unaffected by terrain attacks above Stage 10000

• Special ability 4: Attack ground-units near the targeted unit (Attacks both melee and ranged units.)

• Breaking the limit of Spirit Rest: Increases Spirit Rest efficiency by 0.3%. (Even if the unit is in the Time Shop, up to 10%).

Fire Elemental (Human) Female - 5 star - Magic Damage

*General Throws fireballs, damaging up to 3 enemies and stuns them for a while.

• Skill Attack: Create several fire whirlwinds to paralyze enemies and damage them.

• Special ability 1: 4% basic game speed

• Special ability 2: 3% movement speed and 4% attack range of humans.

• Special ability 3: Unaffected by terrain attacks above Stage 10000

• Special ability 4: Appears quickly, and immune to disables (other than stun, freeze, blow, knockback).

• Fire Resistance: Increases the Fire resistance by 50. (Cumulable even from timeshop, but the max from Fire Spirit is 2000).

Pics of next honor rotation units: http://imgur.com/a/foqnt

New elf and orc units here: https://www.reddit.com/r/EndlessFrontier/comments/669nmd/new_units_being_revealed_on_korean_ef_page_orc/dggr57c/