Apparently, according to some SpoilerTV set photos, the Bulletin attack is in episode 6. Incidentally, that’s also the episode where that earlier released set photo of Matt and Karen with Matt in costume is from. While I might be wrong, I don’t think that’s how Karen will learn Matt is alive (Matt shows up and saves her from Poindexter). I’m more inclined to think that she’s already known for at least an episode or two by that point, or three (it’s episode 3 when Foggy finds out about Matt being alive, according to other set photos). And that seems like an “end of episode” and mid-season twist, for Matt and Karen to learn that Fisk is using a hired killer to smear Matt’s reputation (in the same vein as the mid-season twist of season 1, which was when Fisk blew up the Russians).