The latest update to Infested Planet is out and here are the new features in it:
New Mission - The Return
The campaign has been extended with a new mission - "The Return" - where you face off against an old enemy. You have some help from your army buddies, but you'll have to rescue them first.
This mission steps up the difficulty a bit, by introducing the Guardian mutations to the scripted campaign. You're going to have to figure out how to deal with them.
Fortunately, there's a new technology to help you out.
New Technology - Heli-Drops
In the last update the "Reinforcements" tech was made obsolete by the ability to spawn as many marines as you like. In this update, Reinforcements has been completely reworked.
When you build the tech station, helicopters will ferry your respawning marines to the front lines. Instead of having to walk from your territory, they'll be dropped right into battle. This can be incredibly useful if your team is being killed quickly and needs fast reinforcements. You can keep up the pressure on the guardian hives and stop them from regenerating.
The price for this useful tech is 5 BP and an ammo cost every time a helicoper drops off marines. This means that you can't fight a rolling battle forever - eventually you'll run out of resources.