My recent experience with KLM mass-posting promo points was in summer of 2001, where they had to post 72000 points on many accounts in Germany.
Worked out very good, but actually all german members, that I knew, got the points within one week; but well after the promo ended.
As mentioned earlier, I don`t expect the last qualifying periods to end before late August and I don`t expect a single point on any account before late September....
I guess it is better, not to plan any trips with points before that period....