besides the 3 you listed there's also omega male, which looks like regular male but functions like futa (can impregnate and get pregnant), for those who prefer mxm playstyle.
now regarding femboy/amazon, etc. traits are being planned that could lead to such body types, an example is a masculine and feminine trait that either gender can get, that can make them look either more masculine or feminine (aka make a male look more femboy/trappish or a female to look more amazonian), or enhance what they already are by making a more masculine male and more feminine female. These are just two of many traits currently being considered to be added in the games future.
Incase anyone wonders how I know any of this, I am currently also operating as one of the volunteer game testers and working closely with the games community in brainstorming new features and ideas that will be added later on in the game.