Super Saiyan 100 will be seen in Dragonball EF. It is the ultimate level of Super Saiyan.
Super Saiyan 100 looks basically as a bright light of energy due to the overwhelming power and the user's body would be destroyed in the process and must be wished back with the Dragon Balls. If someone looks directly at it, it would destroy his eyes and kill him after driving him insane, its power is 20 million times stronger than the base form. If it's not controlled, the power would not only destroy the entire plane of existence but the energy would also absorb the host into itself destroying space and nothing (literally).