Roe vs. Wade isn't going away...  Roberts will rule in favor of it because he doesn't like rocking the boat on these things.  He ruled how he did with the ACA case for the same reason.  And people are probably going to suggest that Ted Cruz get the Scalia appointment.  He will be an easy confirmation because it means getting rid of Ted Cruz from the Senate.  

And yes, Trump is likely to appoint Souter or one of his NYC buddies to another one of the openings.