Man that would be so cool, but I doubt they would do that. GW wants you to play the magic elves and steampunk dwarfs factions. No overlap allowed!!
Maybe in the lore we will see this, but it does not seem to be the way GW makes their armies on the table. All the new Cities shooting units and scouts were pretty easy for dwarfs and elves to be added, but GW has passed those options up.
Best hope is that they get the full Tau treatment. Of course are over a decade old and players are still begging for human options....... or really any other race lol.