For now, the encryption plugin is only available on the older version, Nylas Pro. No reason for that other than time to port and QA the plugin to the new free version, which has a completely written mail sync engine that runs locally rather than in the cloud. We're working on porting all Nylas Pro features to the new version as fast as we can!

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Nylas has not made the Keybase/Encryption plug-in available for Nylas Mail. But the source code is GPL. I repackaged it as a stand alone plugin for my own use in Nylas Mail and you can find it here: https://github.com/aarontyree/Keybase-Plugin