Unless @JeremyECrawfordMe and my Warforged player are loving the new UA and races. How does the “Integrated Protection” racial feat interact with spells that deal with metal armor like shocking grasp or heat metal? decides differently later, the intent is that warforged are a very mechanically strong racial option but do contain metal as part of their composition, and thus fall susceptible to Heat Metal or Shocking Grasp. Though, the DM has the final say at the table

— RutyWoot! #Inclusivity (@RutyWoot) July 23, 2018