They have three things to do, first rebalance as required, second dispose of any unwanted holdings and finally buy any new holdings.
I'm not sure how long these things take for institutions (Rob?) but given that the changes so far seem to be small to non existent, it could be quite quickly done. For example, if their description of rebalancing on the third friday of the month (quaterly) means they make the decision on Friday morning, it may only take a couple of days to come into effect. It's possible that my snapshot about a week later could include the changes - which is why I waited thatperiod of time.
However, I will check again in the near future.