With 7 cases left to decide (Tex. DHCA, AZ. Leg, Burwell, Utility Air, Johnson, Obergefell, Glossip), here are the amount of opinions written by each justice this term:
Roberts: 6
Scalia: 7
Kennedy: 4
Ginsburg: 6
Breyer: 8
Alito: 7
Sotomayor: 7
Kagan: 7
Tex. DHCA is a January case. AZ. Leg and Burwell are February. Utility Air is March. Johnson, Obergefell, and Glossip are April.
Kennedy has not written any opinions (yet) from January. Roberts, Kennedy, and Ginsburg have not written any February opinions. Scalia has not written any March opinions. Scalia, Kennedy, Ginsburg, Alito, and Sotomayor have not written any April opinions.
My guess is that Kennedy gets at least three opinions. Kennedy will probably write Tex. DHCA, AZ. Leg, and Obergefell. Roberts looks more and more likely to write Burwell (which seemed inevitable, but still).