Ideas, concept art, prototypes, tests and tweaks, how "Minecrafty" it feels, how it will affect gameplay, how it affects performance in all the different platforms, how balanced it is, how buggy it is, how it fits into the game as a whole, how new festures interact with already existing content, how it will be received by the community, and how ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.