iPhone X
iPhone X Plus
iPhone X Edition
next year X2, then X3, then X4...
Could be a cool way to reset the naming system!
It could be iPhone X but there will be no iPhone "Edition" model. There is already an iPhone SE and whatever the next flagship is named it has to be perceived as being the best. If it's "Edition" that is lower in rank than "SE." (Apple has said the SE stands for Special Edition).