Not sure who to believe, neogaf member panda21 or the lead programmer at house marque.
http://www.eurogamer.net/articles/digitalfoundry-vs-resogun
I already saw this in the resogun thread, that guy is using the term voxels incorrectly.
http://en.wikipedia.org/wiki/Voxel
basically in the old days the only way to render voxels was to use some kind of raycasting. this is quite computationally intensive if you want to render anything that doesn't look horribly blocky, so it has quite often been used along with raytracing in realtime demos of graphics hardware (larrabee and stuff maybe?) because people immediately recognise it as something that takes a lot of processing power.
but this has led to a lot of people misappropriating the term because of its association with high power/cutting edge computer graphics and using it to describe things that are rendered as polygonal cubes, but not based on a grid. Minecraft is an example of something that, whilst it doesnt use a raycasting method to render the world (it draws polygons), the map could be said to be made up of voxels since they are cubes on a grid.
The player characters in minecraft however are NOT voxels. they are made up of polygonal cubes/rectangles, but these aren't aligned with any kind of grid. If they were voxels they would be able to rotate in the way that they do.
I'm pretty sure notch has admitted that minecraft isnt really voxels despite everyone thinking that it is