Concept

We all have an idea in our heads by this stage what the world will look like. The problem is im sure they're all different and somehow we need to get them out and compare them in order to really have a unified game idea.

So assets and the world have to be concepted 

Some of that has been done using Photoshop and drawing and a lot of the "kinks" left over will be ironed out during the block-out stage.

When it comes to assets that's an on-going affair and wont be complete until the production phase. We really need to get an art style and a clear and UNIFIED vision.