I guess those of you who don't like or are against "gun totting" Alfred haven't read very many Batman comics. If you dislike the notion of this then you'll probably hate "Batman: Earth One" and Geoff Johns take on Alfred.
We don't know the context, obviously. However, the term "gun-totting" has a certain connotation attached to it as if he is the Punisher or something, not that he will use it infrequently when defending the Batcave. Not helping matters is the that promo image makes Alfred look as if he works with Vincent and Jules from Pulp Fiction.