The Planetary Campaign expansion for Infested Planet is finally out. Here's what's inside:

• Dynamic Campaign Mode - Fight the aliens on a new strategic layer
• 3 New Weapon Classes: Medic, Grenadier and Guardsman
• 3 New Alien Enemies: Vile Tongues, Bombards and Infested Bunkers
• Updated map generator: Aliens wall off parts of the map

http://store.steampowered.com/app/529620/

The accompanying patch changes a lot of things about the game. Best of all, you don't need the DLC to enjoy it. Here are some of the highlights:

• Added new mutations and reworked old ones
• Revised Scout weapon class
• Story campaign now has a difficulty selector
• Many other small tweaks to game balance