Nothing too big that's out of the realm of possibilities and even stuff we already know they will probably add at one point but you are eager to play around with
Here is my list: Feats: War Caster, Resilient Subclasses: Tempest Cleric Spells: Spiritual Weapon, Booming Blade Subraces: Githzerai (Or any other +2 wisdom race/subrace [I really want firbolg but I know it's not gonna happend])
What's on your wishlist?
Above all: STICK TO THE RULES MORE!!!! Apart from that: more feats, like GWM and PAM, War Caster for sure, Resilient... yeah... many more feats please. I definitely want the Tempest Cleric and Talos worship aswell, also Amaunator and gods like that too. Then I would also love some subclasses from Xanathar's, spells from Xanathar's... yeah.
OH YEAH!! Variant human too. Definitely. And rolling for stats.