It seems that DICE has abandoned the Battlefield: Bad Company series, as the studio is busy with three major projects including Battlefield 4 (and its downloadable content), Mirror's Edge 2 and Star Wars: Battlefront. Executive producer Patrick Bach claims, however, Bad Company has not been forgotten. It's just not being developed right now.
According to an interview, Bach stated, “We can always find talented people around the world. The Bad Company series is by no means killed or anything, it’s still out there.”
He also stated that some of Bad Company's mechanics were absorbed into Battlefield 4. “We merged the Battlefield main game with Bad Company and we’ll continue to do it. I won’t say we’ll never build another Bad Company game again, but right now we’re focusing on Battlefield 4," he noted.