If I recall there wasn't a whole lot of difference between beta and retail for BF3.
Also Nofate said the beta was built on Sept 25, 2013.
http://www.mordorhq.com/showthread.php?11480-So-DICE-has-an-answer-for-LOW-FPS-FREEZES-Second-Assault-Gameplay-November-1&p=239112#post239112
http://www.mordorhq.com/showthread.php?11480-So-DICE-has-an-answer-for-LOW-FPS-FREEZES-Second-Assault-Gameplay-November-1&p=239118#post239118
I tried the beta but it feels too much like bf3 for me. Really not fond of the sluggish player movement.