Individual Movement Values and Saving Throw modifiers were removed from 2nd edition at the advent of 3rd because it slashed confusion between similar, though asymmetrical armies and removed various steps of book-keeping. I can't imagine why bringing those things back, now that the game uses more models per game from a broader selection of armies and units than ever before, is thought of as a good thing.

I've also seen a rumour that the rules for Armageddon: Shadow War are going to be a prototype for 8th edition, which suggests that Range Modifers to different weapons may be making a return. I genuinely struggle to think of something worse to bring back, except perhaps the old armour Penetration and Locational Hit Charts for vehicles.