What patch 9.4 contains is unclear so far, however it is confirmed to have a large hybrid British line of lights, mediums, and weak TDs (as opposed to the juggernauts they have now).
Tier 2-6 branch will be Lend-Lease regular tanks: M2A4, Stuart I, Grant I, Sherman II, Sherman VC
Tier 5-6 (?) branch will come off the Alecto and is made of TDs: Archer, and Achillies
The lines unite at tier 7-10 as TDs: Avenger/Challenger, Charioteer, FV4004 Conway, and FV 4005 Stage II