Even wat info over de most recent build;
Let me start off by saying that the build we played at the GeForce LAN was light years ahead of the Beta. It's the theme that will probably run through the rest of this post; it was a great relief to see how much work DICE has put into polishing BF3 up for the final release. Off the top of my head, asides from few bugs (noted at the end), I didn't run into any of the glitches people were having in the Beta(such as rubbernecking or map glitches.)
Chat interface. FIXED. The chat text now blends in and matches the rest of the GUI. It is in the same location but that black background is no longer there; the chat is overlayed on the screen just like in previous Battlefield games.
Squad screen. FIXED. Pictures of the new squad screen have obviously already popped up on Reddit, and I can't really add anything asides from confirming that it looks exactly as it does in the pictures. However, there still isn't a "Join Squad" option that lets you populate an empty squad. You click "find Squad" and it automatically puts you in a squad just like Beta, although based off the new design it seems like they will have full squad join functionality in the final build (Crash7800, can you back a brother up?).
3D spotting was quite a bit more refined in this build than it was in the Beta. If you spotted someone and then they got behind cover(buildings or vegitation/rocks), their on-screen 3D spot dissappears immediately. No more firing at doritos in the foliage.
Minimap. FIXED! The minimap has been vastly improved and is almost on par with the map found in BF2. It's a nice, full minimap now: you can see all the flags, your teammates, empty vehicles...etc. The only thing that seemed like a minor issue is that the zoom levels seemed funky on some maps (like Operation Firestorm) and there wasn't an option to set whether the map would rotate with the player or remain locked onto the compass.
Rocks can no longer be shot through.
The Options menu is now accessible while dead or alive.
The kill cam screen seems to have been shortened in duration, although this could have just been on TDM.
There are customizable camo options available for the picking now. From what I could see there were a few solid color uniforms (Black, Blue, Green, Tan, Grey), a few different types of camoflouge (desert/forest/urban), and a few special ones like the SPECACT uniforms and one named the "Dr. Pepper" camo which I can only assume will be tied into a marketing blitz just like the SPECACT stuff was tied in with them during BC2. Each camo "selection" had a corresponding Russian and US version so that you would never be able to put on the same uniform as the opposing team.
Hit detection seemed vastly improved. Granted, we were in a LAN environment, but I believe the BF3 servers were actually being hosted down in LA (7 hours away). TDM and 32-player Rush were silky smooth but there was still some weird lag on the 64-player conquest maps. It was fairly rare though, so maybe it was just actual internet traffic issues.
There was a notification now for you to press "Q" if you needed ammo/medic that appeared to pop up automatically if you needed either of those things.
The new in-game icons that show up over teammates, dead players, and dead players who need a revive have been completely overhauled. They are thicker and a bit brighter; the end effect is that they are much more noticeable.
They bumped up the points you receive for completing team objectives. Off the top of my head, neutralizing a flag nets you 200 points, and capping it gives you an additional 250 points. MCOM attacking/defending saw a similar boost.