has any gameplay even been shown?

It was shown to youtubers and press types at a closed session prior to the reveal, so they've been able to relay details about what the game itself is like rather than just what the trailer contained.

Most of them have played it as well, given player/community feedback and it's been noted by DICE (from what they've said).

If you want to see/hear details about the gameplay before they officially show off any gameplay footage then JackFrags and Levelcap are the best youtubers to follow for news atm