Question: when does the next world of warcraft expansion come out
[{'answer': 'August 2018', 'provenance': [{'wikipedia_id': '379591', 'title': 'World of Warcraft', 'start_paragraph_id': 54, 'start_character': 239, 'end_paragraph_id': 54, 'end_character': 250, 'bleu_score': 1.0, 'section': 'Section::::Development.:Expansions.\n'}]}]