Read yesterday on a German X5 forum that already 2 people with X5 with M-Packs on order have received notice of 4 months delays. One guy ordered in Oct'07 and has now been quoted June'08 delivery.
Appears there is a problem with parts availability for M-Pack. Normal versions and sports packs still seem to be on schedule.
Have contacted my dealer as well but have not had an answer yet but I fear the worst
Sam