It also just occurred to me that that might not even be Nick. This could be a fakeout. That tank top isn't what Nick wore into the hospital, nor does it look like something the hospital would have issued him, and I don't recognize either of those other two people. Have we ever seen them before?
Some evidence that it might not be Nick:
1) Based on the fact the hair is long enough to be tied into a bun, either a lot of time has passed and the hair has grown out, or this isn't Nick, as Nick has short bangs.
2) The hair is notably pure black. You can compare how the highlights reflect on previous pages: In this image, the highlights reflect to grey-white, as opposed to on Nick where the highlights are always shaded brown.
3) I feel like the bandages seem pretty sparse considering the surgeries I'm assuming Nick would have. Especially if he's to look more Asian, it feels like there would have been more surgery around the cheeks, forehead, and eyes.
4) Nick has three sets of piercings on his left ear. This girl has none.
That said, these have some pretty straightforward explanations. 4 can be explained as just good attention to detail, as piercings would have been removed for surgery, and it's not worth the effort to put divots into the character model just for the sake of having these details. Elena similarly has pierced ears, but the holes weren't shown in the post-surgery models when she's not wearing her piercings.
3 might be that the surgeries themselves aren't done yet. This is reinforced by the fact that he's not had any chest surgery, and I'm presuming further "enhancements" are still to come. Also, it could just be an acceptable break from reality (and again, for the sake of modeling) to get the point across without getting into too much detail.
1 and 2 are more of a meta explanation to me. Clearly, models are made for the characters as they are transformed, and so this is simply the new model's coloration and hairstyle.
But my guess is that it is Nick, and dressing him up in a pink tank top is to help confuse and feminize him. So he wakes up maximally immersed in whatever new role they've got planned.
EDIT: Super looking forward to this new haircut. Straight bangs can work, but I've found them to look particularly unattractive on Nick.