The Xbox One and PS4 are still a few months away so a few of the finer details won't be available just yet. Usually, the box art is one of the final things to be revealed with any new console, but it may have been revealed early.
The official Battlefield Facebook account was updated after the Xbox One unveiling to announce Battlefield 4 for the Xbox One and PS4. The graphic provided with the announcement features what may be the box art design for both consoles:
Of course, the designs could be placeholders for now. If it is legitimate, Sony seems to be keeping a similar box art design from what it has used with the PS3 while Microsoft will be adopting a more minimalistic design with its box art. It's not a bad thing at all, and the deep green color looks really good.
We'll probably see final box art design a few months before launch, but third parties, like EA in this instance, will probably leak the final box art design long before Sony or Microsoft does.
Now if only Microsoft, or a third party, would be more forthcoming about its plans for used games on the Xbox One. The official statement is that used games will be playable on the console, but Microsoft is being entirely too vague about the whole thing.[h/t: theoneandonly283 via Reddit]