SO
INFORMATION ON BF4My friend playing the secret beta right now said that it detected if you had fraps up, so blah.
There was a watermark, "Alpha Trial" and then your username under it, that shifted each corner of the screen every minute.
anyhow,
Underwater there would be hidden weapons, like that one sniper with the infrared scope in that bf3 mission, since you can dive underwater now.
Also, you can counter-attack knives from behind he said. He was knifed and it said he could, but he wasnt fast enough.
If you spawn in a helicopter, and bail out, you keep the pilot model. More realistic.
Helicopters are on roofs overall so you can just go and grab them. And by roofs I mean those gigantic skyscrapers.
Scope glint is toned down a bit.
Also includes those bullet-crack sounds from ARMA if a bullet flies past your head.
If you start getting suppressed, your character pants/freaks out.
backstab counter
"Chinaman came up to stab a support, support on my team like ducked down and stabbed him instead"
also

[this means hes playing it]