If he does it at all, it should be after he finishes the game. Remaking Chapter 1 alongside the existing game, is only going to cause delay, and it wouldn't be a very popular decision amongst patrons or non-patrons alike. In my experience, most attempts at remastering games, before the games have actually ended, have resulted in those games never getting finished. It's something there is currently little appetite for, and thankfully I believe the Devs feel the same, because I've never once heard them suggest such a thing. I think Deep is quite happy to leave Chapter 1 as it is. And based on his comments about a possible future beyond this game, I think it's extremely likely he will want to move on to something new, once this game has been satisfactorily concluded (which is probably at least 3-4 years away).