More information on new 'external password managers' feature?

[taltman]

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I read with great interest the following GnuPG blog post, that made
reference to a new feature to integrate gpg with 'external password
managers':

https://www.gnupg.org/blog/20150607-gnupg-in-may.html

Where can I read more details about this improvement? Which external
password managers is this intended for? Is there any end user-facing
documentation available?

Thanks in advance,

~Tomer

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