Asked my service guy at the BMW to check up on the M Sport suspension stuff for me and found out some interesting infos.
1) Although the complete M Sport suspension kit is not available, you can order the individual components via part numbers (I got those from RealOEM. Thanks grim
) Parts are over HKD20K. Labour and other glue item (parts necessary to fit the suspension) is extra.
2) He adviced me to wait for a complete retro kit to be available before considering. He thinks will happen soon.
3) With regards to warranty issue, my guy said that if BMW installs the retro kit, the car will still have the normal 2 years warranty, and 2 years warranty on the retrofit kit as well.
So there. For "unfortunate" bros here who are interested in the m-sport suspension upgrade, patience is the key