For a fact they've said we will be able to see our character in the game so it's not a complete redesign. And for the second we don't know how much work will be needed to bring TPP.
There would be a lot of work because the game is designed as first person, it's not just a style choice.
Augmentations affect your vision, hud is a cyber enhancement by itself, you need completely fluid vision control to appreciate the landscape, etc.
There's also no redesign, as early as 2013 we knew the game would be mixed fps and third person with fps being main one.
Every single dialog and every single time you get on your car the game goes third person, that's what we know so far.
Not to mention the recent interview
Game is first person, game is designed around first person, deal with it, adding/changing to third person would mean completely changing the hud, the way enhancements are added, vertical design, pretty much everything to make sure it works correctly and many things would get cut.
I find it INSANE that people would rather have a delayed, cut content and not close to the dev vision project instead of what the devs want just because of their own selfish views on what the game should be.