The WWI rules supplement will be in Wargames Illustrated #322 (US).
To aid you in your figure organization the promo PDF I saw had:
German
Co HQ: 2 x Command Pistol Teams, and up to two Anti-Tank Rifle Teams
Infantrie Platoon: Command SMG, 6 x Rifle Teams, 2 x Rifle Grenade Teams
HMG Platoon: Command Pistol Team, 4 x HMG Teams
Stoss Platoon Command Pistol Team, 4 x Pistol Teams, 1 x MG Team
Infantry Gun Platoon: 2 x 7.62 Krupp Guns (No Command Team?)
Panzer Platoon: 2 x A7V (or Beute Mark IV) (No Command Team?)
Brits:
Co HQ: 2 x Command Pistol Teams, optional Sniper Team
Rifle Platoon: Command SMG, 6 x Rifle Teams, 2 x Rifle Grenade Teams
HMG Platoon: Command Pistol Team, 4 x HMG Teams
Mortar Platoon: 3 x 3" Stokes (No Command Team?)
Artillery Detachment: 2 x 18pdr QQF (No Command Team?)
Heavy Tank Platoon: 2 x Mk IV Male/Female (No Command Team?)
Medium Tank Platoon 1 or 2 Mark A Whippet (No Command Team?)
The interesting part to me was some platoons having no command team present. Maybe they are "independant" or maybe there are some harsh command and control aspects to these "attachments?"