[He's touched, and a little sad, and a little hopeful.]

As much as I know better than to go into meeting her with any expectations, I still find myself hoping she's got a fair bit in common with you.

[Really, he wishes she would just be the person he's grown to love and think of as one of his own, even though he knows that's not possible. They're from different worlds, and he's going to miss her regardless of what the Jean Grey he's going to meet is like.]