My main prediction is that we will see a super saiyan white. Now fire as it gets hotter and hotter changes color from Yellow to red to blue to white and then violet. Black Goku of course has to be super strong and will give SSjB goku some trouble. Toriyama has gone on about contrast in colors in Super. With Black goku whom I think will have a black aura. Will represent Yang and Goku's white aura representing Yin would make complete sense.
How black goku came to be? They are called something.... but I believe from universe 6. An evil Kai went to earth and found goku's body to which he gathered the corpse's DNA and was given extraordinary strength. Toriyama said the supreme Kais and Champa will be involved. Why? it's because black or an evil Kai came from Universe 6. Black Goku called Trunks a saiyan which I've never heard a saiyan refer to another saiyan as "saiyan". Or the 2nd would be since universe 6 and 7 are opposites. black goku went from good to evil and by some means went to universe 7 from 6. And Black goku must have a lot of pride and thinks highly of himself to which he thinks his own race (saiyans) is beneath him.
How black goku came to be? They are called something.... but I believe from universe 6. An evil Kai went to earth and found goku's body to which he gathered the corpse's DNA and was given extraordinary strength. Toriyama said the supreme Kais and Champa will be involved. Why? it's because black or an evil Kai came from Universe 6. Black Goku called Trunks a saiyan which I've never heard a saiyan refer to another saiyan as "saiyan". Or the 2nd would be since universe 6 and 7 are opposites. black goku went from good to evil and by some means went to universe 7 from 6. And Black goku must have a lot of pride and thinks highly of himself to which he thinks his own race (saiyans) is beneath him.