Probably no way of knowing, but I would be interested to know how many people pre-order BF4 compared to BF3? There are 15 or so people on my friends list for BF3 and everyone quit playing consistently around the time the close quarters expansion(#3) came out. I highly doubt any of us will pre-order, when all but a couple of us did before.
Fixing the netcode and putting some actual BF sized MP maps back into play will be the only thing to bring me back. Lots of other issues as well but I've ranted about them before so, I'll spare you readers.