Here is a list of what is being rumored for the starter set. Its Blood Angels vs Orks, and I believe that the Sanguinary Priest may be the limited edition add on.
Please remember that these are rumors.
via an anonymous source on Faeit 212
-Captain with Jump Pack
-Tactical Squad (10)
-Assault Squad (5)
-Terminator Squad (5)
-Dreadnaught with Multi Melta and Autocannon
-Sangunary Priest (with Corbulo option)
-Balla Boyz Mob (10)
-Moscha Boyz Mob (10)
-Meganobz Mob (5)
-Kommando Mob (5)