Any idea who the young individual with different eye colors was?
It rings a bell but I just cant place it.
I didn't catch that image in the preview so I am not sure who you're talking about. However, the one x-men character i can think of off the top of my head with different eyes is Mastermind. He was also in X2 as Stryker's grown-up son (Jason Stryker - he was lobotomized and spinal fluid taken out and used as a tool by his father for the purpose of tricking Xavier and others). So it could very easily be a younger version of him (Jason/Mastermind) since Stryker will be there.
(This is presuming that I am remembering correctly in the fact that Mastermind has different colored eyes)