And promptly found the game is addictive as fuck. It's literally Minecraft crossed with Teamfortress 2.
Essentially, the maps are made up of Minecraft style graphics and completely voxel based. They're not the most cutting edge graphics, but they have been finished off somewhat (similar to Landmark) with the maps almost entirely destructible. In a nutshell, it's 5v5 class based combat on local australian servers. The game is as simple as defend your base while destroying the enemy. The main target is a large cube object, with 1-2 cubes on average before it that need to be destroyed first in a link before the main base can be contended.
The game feels like one of those rare gems that just works in an amazing way (not unlike Teamfortress). There classes are a combination of defensive/support, full assault and heavier front-line. You're given complete freedom as to how you want to either attack or defend. The map starts with a 4-5 minute period where you and your team setup defences - including things like building the defensive targets in, or setting up elaborate killzones - then the barrier drops and it's all in.
You can either attack in the normal way above ground, or can burrow through. You're given everything from sentry guns to mines, grenades, rockets, gas traps yadda yadda. You're also given a range of different block types depending on class - for example the soldier type class has concrete blocks which are harder to drill through.
Every player has 2 weapons, a special skill and a tool. The tool is used for both building things (such as walls, weapons, defences) and cutting through other blocks. Destroyed blocks give a resource income which is then spent on building things.
It's just a nuts game - the freedom to build and destroy really suits the style of gameplay. Recommended!