New Hero:
An awesome update would be the goblin king for any townhall level! Because there is the campaign levels and there already is a goblin king once you get 150 stars on the campaign you capture the goblin king and he becomes yours! His special ability is either jumping over the walls or sending lightning strikes on gold, elixir or dark elixir. This should come in the next update.
If you have 150 stars then you go to the buildings (where the archer queen and barb king are) and click on it. He will instantly be purchased.

New Dark Troop:
For the next dark troop, it should be a Spearman. You unlock this at level 9 Townhall.

Info: (Lvl1)

Damage Per Second: 50

Hitpoints: 80

Training Cost: 100

Favourite Target: Any (3-7tiles)

Damage Type: Single Target*

Housing Space: 3

Training Time: 3mins

Movement Speed: 30

(Info on the troop):

These strong warriors are born from the dark. Defeat is not an option for them as there long distance shots fly past the opponents walls.

*When a higher level it can shoot buildings at a time