Fantastic game you have here, I have been playing through all the factions and the Tau are a great addition
However I wondered if you would consider adding the Astra Miltarum? They're an incredibly popular army and would be so fun to see manifested into the game. They also have a huge varied roster you could choose from.
HQ command units could be:
-Lord General
-Kommissar
-Sergeant
-Inquisitor
Etc.
Just think it'd be a great addition to the game, and would likely be a good seller.
Thanks