Quote Originally Posted by Moros
I believe it was planned for them to be in the late project, but I'm not sure.

Wikipedia says the Yuezhi were at war with the successor states of Alexander and invaded Baktria:

"The Great Clan of Yue", is the Chinese name for an ancient Central Asian people. They are believed to have been the same as or closely related to the Indo-European people named Tocharians (Τοχάριοι) by ancient Greeks. .....

Invasion of Bactria

One of the first Yuezhi coins, imitative, in crude style, of the coins of the Greco-Bactrian king Heliocles, circa 120 BCE[citation needed].
Obv: Presumed bust of a Yuezhi chief with Greek royal headband.
Rev: Zeus with thunderbolt and sceptre. Misspelled Greek legend BASILEO HELIOLEEU "(of) King Heliocles".In 124 BCE[citation needed] the Yuezhi were apparently involved in a war against the Parthians, in which the Parthian king Artabanus I of Parthia was wounded and died:

"During the war against the Tokharians, he (Artabanus) was wounded in the arm and died immediately" (Justin, Epitomes, XLII,2,2: "Bello Tochariis inlato, in bracchio vulneratus statim decedit").
Some time after 124 BCE[citation needed], possibly disturbed by further incursions of rivals from the north, and apparently vanquished by the Parthian king Mithridates II, successor to Artabanus, the Yuezhi moved south to Bactria. Bactria had been conquered by the Macedonians under Alexander the Great in 330 BCE, and since settled by the Hellenistic civilization of the Seleucids and the Greco-Bactrians for two centuries."