There are 7 countries with missions: Mexico, Norway, China, Germany, Japan, France, and the UK.
Each mission is limited to a specific country (and yes you can request a country).
Basically, you get a "fastpass"-type card with a check-in station and time.
When you arrive, you can request a certain country from the CM and they will give you a Kimmunicator.
The Kimmunicator gives you all the instructions including a brief demo of how to use the Kimmunicator.
Within each "mission", there are several tasks.
There are about 10 tasks or so for each country.
However, each "mission" only selects a subset of the tasks available so each time through can be slightly different.
Each country should last you between 20 minutes and 45 minutes depending on whether or not you are familiar with the country's layout.
The finale is always the same though.
The tasks include, but are not limited to, interaction with animatronics in the country, researching clues, trivia, or interaction with CM's.
We rate Germany, UK, China, and Japan as our favorites.
UK and China offer interaction with CM's as well as actual hands-on activities (find this object and take it here).
Germany and Japan have the most interaction with the pavillions themselves including lots of surprises along the way.
We definitely recommend the Kim Possible World Showcase Adventure.
Our kids have done all 7 and have even returned to their favorites and were delighted by getting new tasks!
For those that have done the KP Missions before, are there any particular countries that might have easier missions for our younger kids to figure out the clues without us? Not that we are letting them just go off by themselves 
but if our older son is able to read the clues and figure out the mission without help from us he might enjoy it even more.
Together we figured it all out - you can go back and replay the clues (thankfully).
Not exactly what I wanted to hear. If this is the norm, how do people do 4 missions and take up 2+ hours of park time?
