I haven't the faintest idea why CBS would ever produce a new Star Trek series about Worf. I mean, he's popular with hard-core Trekkies, but the general audience? Why would they watch a show about him?
Well between the TNG movies and ST09 there's an increasing trend to give Trek an action heavy theme. Even Enterprise focused more on random fighting and less on moral and traditional sci-fi themes.
So Worf would be the perfect captain if the premise of the show's going to be fighting in space.