There has been some promotional BF4 GameStop posters claiming there will be 3 playable factions as well as the return of commanders to the Battlefield series
It hasn't been officially confirmed by DICE or EA yet but if its plastered all over GameStop stores then chances are good its credible (but not entirely, so don't give your hopes up)
Edit -
Does look kind of on the fake side so who knows
UPDATE -
More alleged 'official' promotional material was leaked
http://www.bf4blog.com/latest-leak-confirms-release-date-and-first-dlc-content/
It hasn't been officially confirmed by DICE or EA yet but if its plastered all over GameStop stores then chances are good its credible (but not entirely, so don't give your hopes up)
Edit -
Does look kind of on the fake side so who knows
UPDATE -
More alleged 'official' promotional material was leaked
http://www.bf4blog.com/latest-leak-confirms-release-date-and-first-dlc-content/