I have come up with a theory of why DICE have chosen to make BF4 instead of BFBC2. Now I actually havent properly played any BC but I hope this is a good interpretation of DICE's motives.
When BF3 was released, a lot of BF veterans (who have played BF2/BF1942/BFVietnam/etc.) complained about things like: no commander, no jet bombs, no VOIP, COD like maps such as OP:Metro and CQ DLC, no mod tools, limited destruction (even BC2's destruction was better), and the mass arrival of players from cod,lack of factions,etc,blah blah.
Then I remember Roland or some other DICE dev talking about Frostbite's potential, that BF3 was just a stepping stone. I realised that BF4 is going to be THE Battlefield weve been waiting for. I hope that DICE will bring back all the original things that made me and lots of you guys love about the old battlefield games such as getting blasted half a mile in the air by an artillery strike, or watching the titan in 2142 explode or getting your first loopzook kill in 1942 back into BF4 and future games.