In Aug 2009, it was reported that Cia Cia, a minority language of Indonesia was planning to adopt Korean Hangul as its writing system (
Korean Script Heads to Indonesia). Unfortunately, it turns out that nothing official had happened yet, although specialists in Korea had been talking with the Cia Cia community. However, it appears likely that the Indonesian government would require that any indigenous language adopt the Roman alphabet (also used for modern Bahasa Indonesian, the official language of Indonesia).
Too bad – it was an interesting concept. There are other historic scripts in Indonesia besides the Roman alphabet, but Hangul may not be joining them in the near future.