The work on them started as side projects of some team members. PR:WW2 for example was then taken over by community members, getting it up to PR quality. Most of these members are now PR team members though.
The plan is to get both Falklands and WW2 into PR when they're ready, so no worries

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The events held until now were to test the content and gameplay with a larger crowd rather than just the PR testers.