If you clicked this news post, chances are you're looking for a screenshot or something similar that shows evidence that Dr. Halsey will be in Halo 4.
Unfortunately, that's not the case. Instead, what we have is a video that shows the people at 343 Industries working on the game's script and you can plainly see the name "Halsey" in it.
Give the trailer a watch to see what I mean.
For those unfamiliar with Dr. Halsey, she's known in the universe as the creator of the Spartan-II Program and MJOLNIR Powered Assault Armor. If I'm not mistaken, she has only appeared in Halo: Reach and this might be her first time to show up in a proper Halo game.
While she might not appear in the other games, Halsey still plays a prominent role in the Halo universe to the point that she's even mentioned in the Halo books.
While the video above might not be 100% proof, it does have some weight when you see it.
I guess we'll know soon enough once Halo 4 hits retail on November 6 exclusively for the Xbox 360.