According to an interview with DICE’s Karl-Magnus Troedsson, he says BF3′s single player was “too linear and too controlling of the player”, it was linear so they could have a “cinematic story”
They want to make Battlefield 4′s single player more open, a “multiplayer sandbox”. I think Battlefield 4′s single play will not be anything amazing, but it will be good, seeing as the single player is used to “prepare them for multiplayer”. They want to give us the weapons and vehicles you use for multiplayer in single player so when you go online your ready!
Most of us Battlefield fans know this series is all about multiplayer, although as much as 20% of people never played Battlefield 3′s multiplayer according to EA’s Peter Moore. Shocking huh?