Obviously finals announcements won't be before prelims and an adjustment will be made before Worlds.
Also, From the Worlds Packet which is available for everyone to read:
NEW
– IASF Nations Cup Championship –
will now be the title of the preliminary round in all four of the
International divisions held Saturday, April 30, 2011 at
ESPN Wide World of Sports® Complex. All U.S.
teams, not competing in a U.S. Worlds Trials and non
U.S. teams entering into The Worlds International divisions
and the top 10 ranked U.S. Worlds Trials teams
must compete in the IASF Nations Cup Championship.
Following the completion of the IASF Nations Cup
Championship divisions, the USASF/IASF will award
trophies to all teams by their ranking within their own
country. The IASF Nations Cup will also be awarded
to the top 5 countries (ranking of nations) in each of the
divisions. Each country’s score will be determined by
the average of all teams’ scores from each country
entered in the division. The highest scoring team from
each country, ranked in the top 5 nations in each division,
will be awarded the country’s trophy.