I think Late March reveal, with new technology appearing coincidently in the S/X (they are always improving, so deal with it). Potentially the HUD will be: eye-tracking, quite large in windscreen, also projected onto a passive screen with touch (replacing the lcd display in the prototypes), and possibly display across the entire vertical strip on the dash. I think it will be advanced. It will display HUD and AR, in that it will show what objects the car has identified and whether they are threats, routing info, and other info useful to driving. They will put in the best hw they can afford, and update the software for the display in a continuous way.
[[ However, I am trying to suppress my prediction as I do not want to be disappointed. ]]
[[ I am not sure how much of a gimmick the haptic 3d touch thing is ... ]]