I just don't see the technology being there to put all that under the display. A dot projector, flood illuminator, infrared camera? All shoved under a display each with their own custom way of emitting/receiving light in-between pixels covering them up at 460 ppi? You are talking about magic.It will go under the display
We have seen under display cameras before and it comes with serious compromises such as lower quality photos and visibly lower pixel density (screen door effect) over the camera area. I think getting these sensors into a slightly wider bezel is more likely given that the infrared camera doesn't have to be as high resolution as the standard camera. Face ID sensors crammed into a wider bezel and TrueDepth camera in a hole punch.