Recently, DICE gave an opportunity to the Battlefield community to show off their creative and artistic skills. On Monday July 15th Battlefield posted on their Facebook and Twitter page a template to create dogtags in the Battlefield 4 style. They said that very good submissions have a chance at making it into Battlefield 4 as a community made tag.
Here is the Facebook post with information and some examples. It is not certain at this point if DICE will select any dogtags to be included in Battlefield 4, and there is speculation that it would only be as a community wide dogtag that would be unlocked for everyone, rather than one that be unlocked by fulfilling a certain requirement.
If you are a member of the reddit community, there is a post with a lot of information and submissions to take a look at here.