@Dirk Walsh Rumourmongering is dangerous and some more care should be employed before publishing some rumours as it can discredit the source of that publication if it has not been thought through and perhaps researched a little bit, rather like criticism.
@José Sanchez It was not the IAAF that came up with the format of the Diamond League but the meeting promoters themselves, and they were following the precedent that the IAAF had given them in excluding the Hammer from the Grand Prix Final in Monaco which was on the basis of facility limitations, but the door was open. The main problem here is that the Meeting Promoters do not like the Hammer event and are in general uneducated about the Throws events, They do not like big Hammer (or Discus) cages getting in the way of the viewing public, and most will choose to exclude the events rather than look at solutions such as Berlin has done where they have made a special white netting material; which does not restrict the viewing, but unfortunately is not strong enough for the Hammer, or the use of great design of Cages such as the Lance Deal designed "Thunderdome" Discus cage that folds flat in 1 minute so can be taken down immediately after the event. This is the reason they give and choose to have the Javelin and Shot events.
Of course Koji and Adam have raised their opinions about the lack of Hammer in particular at the highest levels within the IAAF, but it is still down to the meeting promoters as to which events they include so the public has to make their feelings known to them. Is there the demand within the "General Public" for these events....this is always a concern, and this and a general lack of understanding is also why we generally only see highlights of the top 3 throws in the TV coverage.