Hello, new to this boards, been reading the Ultimate comics for two years already. I think the voice is Wolverine. Remember that Bendis uses a different style of using dialogues and word bubbles than Millar, and he probably used the word bubbles that way in fooling us into thinking she was talking to Cyclops. Bendis likes to fool and mislead people in his stories, and this scene could be no exception.
Wolverine would also want to comfort Jean after the traumatic experience she had with the Phoenix Force, since he has a pretty soft spot with her, and Cyclops also said the same thing to him "about Xavier/the X-Men are here to help us" during the ROTK arc.
That's why at the end when Scott enters the scene, the conversation is cut abruptly, and it pans to Jean Grey looking at Wolverine outside, with Logan looking back. They can't really talk with each other personally since Jean's with Cyclops, he might not be too comfortable seeing the two ex-lovebirds at the same place by themselves.
I may be wrong, but for now, I believe that Wolverine is the "voice".
Also, I don't think Ultimate Emma Frost has any telepathic powers. If she had, she would have shown it off to the President, and I think the writers wanted to make her powers unique since SHIELD already has an army of telepaths on their payroll.