Actually we spent the past 2.5+ years building a meta engine beneath the current game that will allow us to produce future games much faster. The first one is the hardest and takes the longest as all the rules need to fall into place. Afterwards it will be much easier to create new exciting settings because we only need to add the delta in graphical resources plus actual new game content (maps, stories, quests) but the basic underlying infrastructure (rules, items, monsters) mostly will be in place (except for mentioned new content).
This not only will allow producing more games much faster but also will allow all existing games to grow in parallel (because if we e.g. add Mindcraft for one game, all games in the line can have it).