According to Dutch newspaper NRC (comparable with Financial Times), KLM and MAS will announce on Saturday their cooperation in Kuala Lumpur. KLIA will be KLM's asian hub, AMS the european hub. KLM won't take a financial stake into MAS.
KLM and MAS will integrate their flight operations and start joint promotions.
Furthermore, it is also announced that Schiphol will invest into KLIA. Not a major suprise..
Here's the link to the article, but unfortunately, it is in Dutch...