Ok so Overlord (a developer from WarGaming) has released a partial list of things to come in 7.4, he does say that there will be more closer to release, a release date has not been said but hey 7.3 has just come out. Here's the changes/additions straight from Overlord's Blog:
Let me just add, NEW GAME MODES, FINALLY
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Extension of French tech tree-
SPGs:
- Renault BS
- Lorraine 39 L AM
- AMX 105 AM
- AMX-13 F3 AM
- Lorraine 155 (50)
- Lorraine 155 (51)
- Bat. Chatillon 155 (features cassette reloading or autoloader)
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TDs:
- Renault FT AC
- Renault UE 57
- Somua Sau 40
- S 35 CA
- ARL V 39
- AMX AC de 100
- AMX AC de 120
- AMX 50 Foch
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MT:
- Renault G1R
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SPGs:
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New premium vehicles previously available only to supertesters:
- Soviet premium heavy tank of tier 8 Object 252/IS-6
- German TD of tier 8 JagdTiger mit 8.8cm KwK 43 L/71
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Two new maps:
- Wide Park. This map is based on Munich landscape and contains a large city part.
- Airport/Airfield. The map features airport located in the desert.
In addition to that we can expect a bunch of new premiums available for supertesters only until 7.5.
Also at this stage a lot of work is being done on the following stuff:
- multiple UI improvements, especially the design of tank trees
- new camo patterns
- new game modes - Assault and Counter battles, both entered the final production stage
- new sound effects
- improvements to the current team damage reimbursement mechanics