I feel that the old UI is becoming obsolete and clunky. Some of the ways of gaijin showing objectives are too.
A great example of this is the highly visible white “chalk rings” that designate a capture point.
Another example is the old school “vehicle type” indicator, showing specifically the type, being a SPG/H, Heavy, Medium/MBT, and Light, as well as SPAA, need a bit of a rework and be a little bit smaller on the map.
The massive “The enemies are capturing the zone” text that pops up in the middle of the screen is just in the way, and annoying in combat, and instead should just be moved and slightly minimized.
Another thing is the ability to mark targets, everyone knows the standard “attention to the designated grid square” system, or the squad ping/mark system. This is generally outdated and should be replaced with simply stating “Target; Azimuth ___, Golf-Sixer” or something of the like.
I feel these would be generally liked and accepted changes, feel free to add any minor UI changes you would like to see.