Unreal Engine 4.3 Update Preview

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I have a few questions:

  1. Can I work safely on 4.3 Preview? I don’t want situation like crash my project in the future.
  2. I look at Roadmap and see for June: Integration of DetourCrowds. It will be available in 4.3?
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The roadmap unfortunately doesn’t indicate when something will be released, but when something will be researched within Epic.