I'd remove pretty much all HUD elements, especially all friendly player indicators, and rather replace them with 'blue silhouetting', for players in sight on center screen. And I'd add a button to momentarily active all friendly HUD indicators, as well as all kits on the ground in my vercinity. Kinda lika a 'highlight all loot' button in a loot piniata game, just adapted for Battlefield.
I believe there shouldn't be any default HUD being obtrusive on my center screen. My center screen is for seeing and aiming. Battlefield 3's HUD/UI can be very obtrusive, with many elements, like the Capture Point Markers and 'friendly blue triangles', taking up prime real estate in center screen - where I want nothing but my crosshairs. On PC, with 64 players, the friendly blue HUD indicators too can become a major inconvenience, since more often than not, friendly blue markers will overlap with hostile players - adding split-seconds to my reaction time, because of confusing contradictory visual feedback.
Watcha think? Do you agree that center screen should be freed from as much HUD as possible? Do you like the Blue Silhouetting solution? What would you want to happen to Battlefield's HUD/UI design?
P.S. Here's another suggestion. As for downed players, I'd love to see a countdown timer rather than just a downed symbol, it would help a lot for proper decision making. To do Triage and such. Weigh risk versus reward. In general, I'd love an increase in quality of information given, with a simultanious decrease of center screen clutter.