An ARM specific Java OS So that it will work on any arm machine but its not fully Java compliant its more optimized for ARM and can make better use of Native to ARM machine language. Also JavaDOS for ARM could offer the latest features multi-threading open-gl or even vulkan drivers. Any games made for JavaDOS could be run on Practically any modern ARM computer something that could be capitalized on. It comes with the dos prompt, dos tools and there could be a fully customizable menu system that can run Basic coded app scripts for the gui.
So the real horse power and data is used when not in the GUI on some game or Powerful Dos Application. All it'll need then is a web browser which could be baked into the menu but the menu should not be active if you are running a program in dos.