Personally, I really hope familiars get reworked for warlocks. Familiars are meant to be personal to some degree, not just you being able to summon a random creature. I think giving you a choice of potential familiars when you're high enough level would make it feel more special.
I also hope that when Pact of the Blade becomes available, your weapons will look different based on which category of patron you take. That might be a lot, but it would be cool for a GOO weapon to look different from a fae weapon, etc.
