The aftermath of pilot's blood bath is largely a quiet affair. "The Ivory Tower" further develops characters with small, seemingly insignificant moments. At the heart of the boardwalk is Nucky and his dealings with everyone else, and he's displaying the sociopathic tendencies we've seen in guys like Tony Soprano. With Jimmy, he can be stern and uncaring, snippy with Agent Van Alden, and very gracious to Margaret.
As far as the murders go, the feds and press are poking around, but they have nothing so far--though Al Capone delivers a "message" to a reporter, beating him half to death. On the other hand, there was no word on Jimmy's involvement with the feds, or any implication that he ratted out Mickey Doyle.
I'm very tired right now and typing on my lap, so this review will be short. After Mad Men ends, I'll be able to write longer reviews.