Unfortunately we know almost everything in the universe with only small exceptions because we have basic idea on how everything works according to the quantum physic. you can expect some new discoveries but pretty much anything significant woud break entire physic understanding and make you omnipotent.
Consider teleportation if you manage to teleport object from 1 floor to the 6th floor you can generate energy by dropping it down so you will make perpetual motion engine.
remote controlled bodies are possible because you can pretty easily connect to peripheral nervous system all our bodies are controlled by nerve fibers just like plain copper wires all you need to do is connect to them and this is not even too hard because those neurons grow into any holes you present then in their path.
All you need is to cut some nerve, place the edge in front of interface chip and it will grow into it properly and connect.
Unfortunately this technology does not work on central nervous system in both directions. You an get data from CNS but you cant send it back
current brain computer interfaces are plain nonsense, they are as if you take bunch of wires and jam then into your computer motherboard. then try to analyze what data you are getting or try to inject something.
This is not how things are done properly, if you want to connect to the brain you have to use proper interfaces that already exist in the brain. like for example optic nerve, but of course you will have to remove already existing device to replace it with something new.
this is why this technology is not to desirable unless you already lost something of your own like if you lost your hand it can be replaced with robotic device which can be controlled over any distance.