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What about in D20 legends? You have mentioned that there would be less of a difference between HD and levels.
We intend to remove HD completely. We're aiming to make monsters of X levels roughly equivalent to NPCs of X levels in terms of power. So if you've got a 10th level succubus, she's roughly equivalent to a 10th level character.
This is to both make it easier for new GMs to build diverse encounters, and also to make it easier to use monstrous creatures as NPCs or PCs, and I plan to have them advance in similar ways.
Also, by removing HD, creatures will not be shoehorned into having particular base statistics based on type. This means you could have beefy fey, or physically weak monstrous humanoids (who had more magical abilities). Essentially, you'll progress monsters along a martial/hybrid/magical path just like PCs are advanced (and you can mix and match to taste).
The big challenge will be explaining where certain abilities fall in the level spectrum, but frankly this needs to be addressed anyway. You shouldn't have to rely on some vague notion of common sense or intuition to know that a CR 3 creature shouldn't be able to steal your soul or cast you into hell. Even WotC dropped the ball with the Monster Manual II having CR 8-9 constructs who had at will mage's disjunction and disintegrate (when disintegrate was save or die instead of damage).
As for familiars and such, I currently plan to have them advance with their masters similar to how they do in normal d20. As to what that advancement or the options around it will fully entail hasn't been determined yet (I've considered making them the more magical equivalent to having an animal companion), but that advancement will assuredly include advancing things like HP, BAB, Saves, Feats, and Ability scores.