Malev is currently in the process of joining Oneworld I believe.

I would personally love to see China Airlines come in, as my flying involves Taiwan and CI gives good options for flying into / out of TPE. They already do a bit of codesharing with KE, DL, etc. but their TPE -> HKG and BKK as well as BKK -> AMS don't currently codeshare with any members. Their customer service is excellent. They can be used for legs in a Delta RTW fare, but if you connect to another airline (such as KLM), they currently cannot check you in for those legs at TPE.