It's a mixed bag in my opinion. Variable movement rates and armour save modifiers returning could be good, but it depends on how other rules are changed in relation to them. Hopefully, the changes would be more like those made to Warhammer when it was converted into Age of Sigmar, as reverting to second edition save modifiers would be a very bad idea in my opinion.
I am not convinced by the proposed changes to the morale system and charges. Depending on how certain other rules, notably movement, actually work in practice, they have the potential to mess the game up in my view. I'm also not a fan of homogenising morale in 40K. Some units really ought to be immune to its effects.