This is a big list, but I hope at least a few of these to appear in Sid Meier's Civilizationn VII eventually. If I had to pick only five then I would choose Alexander's return, the Spartan king or general as a leader, the return of Byzantium with the Tagma/Kataphraktoi, the return of Macedon with the Hetairoi and Olives

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If none of my wishes come true, then it's okay, and I still love you Firaxians and believe in your capabilities.
The return of
Alexander the Great as a leader.
The return of
Hannibal Barca as a leader
The return of
Shaka Zulu as a leader
The return of
Babylon as a civilization.
The return of
Scythia as a civilization in the Antiquity Age with a horse archer unique military unit that includes female warriors too.
The return of
Gaul as a civilization in the Antiquity Age with a sword infantry unique military unit.
The return of
Macedon as a civilization in the Antiquity Age with two unique military units. The
Hetairoi and the
Phalangite. If one needs to be picked, then let it be the Hetairoi.
The return of
Byzantium as a civilization in the Exploration Age with two military units. The
Tagma and the
Dromon. If one needs to be picked, then let it be the Tagma.
The return of the
Aztecs in the Exploration Age, with
Cuauhocelotl (a combination of Jaguar warriors and Eagle warriors) or
Ocelotl (Jaguar Warriors) as the unique military unit.
The return of the
Holy Roman Empire in the Exploration Age, with the
Teutonic Kinght as the unique military unit.
The return of
Viking Denmark or
Viking Norway in the Exploration Age with two unique military units. The
Dreki and the
Berserkr/
Ulfhedinn/
Huscarl
Feudal Japan to appear as a civilization in the Exploration Age with the
Samurai unique military unit and either the
Shinobi or the
Daimyo as a unique civilian unit
Thrace to appear as a new civilization in the Antiquity Age, with the
Peltast as the unique military unit.
The
Sassanids to appear as a new civilization in the Exploration Age.
The
Kievan Rus' to appear as a new civilization in the Exploration Age, with the
Druzhina or
Varyag as the unique military unit
A Spartan general or king as a new leader, be it
Cleomenes I or
Leonidas I or
Brasidas or
Agesilaus II.
The inclusion of one Byzantine militaristic leader, be it
Belisarius or
Heraclius or
Basil II.
Tlacaelel I as a new leader.
Takeda Shingen or
Miyamoto Musashi as a new leader.
Olives,
Figs,
Honey,
Cinnamon,
Vanilla,
Tomato,
Potato,
Copper,
Ruby,
Amethyst,
Mastic,
Lobster,
Linen,
Papyrus to appear as resources, but my most wanted is Olives.
Since
Hagia Sophia will likely be the associated wonder with the Byzantines, I would like to see it be represented for once more Christian and less Ottomanish. This means the wonder needs to have a cross on top of the dome, and it has to lack a few buttresses and the four minarets. Instead, the Column of Justinian can adorn the wonder just as beautifully at the side of it.
The return of all the
Seven Wonders of the Ancient World.
More military units as Suzerain bonuses from City-States (Rhodian Slinger, Cretan Archer, Templar Knight etc.)
Modding tools to have
more capabilities and to be
easy to use for newcomer modders.