개인적인 생각입니다만, LAN의 입지가 더욱 크기 때문에, 원월드로갈것 같은 생각이 드네요.. 아래는 latam의 FAQ에 나온 내용입니다.. 여기저기 간을 본다는 내용인데, 원월드일 가능성이 크겠죠.,. ㅎㅎ

LAN is a member of Oneworld and TAM is a member of Star Alliance. Is anything changing?
We deeply value the alliance relationships we have built. In the short term, there will be no changes regarding our alliance partners. Continue to book and fly on alliance partners as you would today. After the transaction is completed,  LATAM would evaluate the best alliance options for the combined carrier group.