It’s that time of year again: late spring, when “True Blood” unleashes wave after wave of cast photos, behind-the-scenes looks, promo videos, featurettes, and guerrilla advertising in order to build buzz for the new season. Embedded below is the new trailer for Season 4, which — as we saw in the Season 4 tease — deals with witches and Anna Paquin’s continued butchery of a southern accent. There are other story lines as well: Vampire Bill seems to have a new job, shape-shifter Sam gets seduced by a spicy Latina, Jason is held captive, and Jessica’s boobs still look great. I predict that the new season will hold my attention for a solid four, maybe even five episodes. Depends on how much nudity there is.