Over on the official site there's a post in the PTR forum. Lore states that the patch is focusing on the level scaling mostly. However, he also states that datamining sites will see things that aren't implemented yet and are set for BfA, like Allied Races. That seems to go against the hope that 7.3.5 would contain the 4 revealed races already, saving the last two for the expansion.
Here's the link:
https://us.battle.net/forums/en/wow/...9567370#post-1