This morning I received a number of emails from WordPress sites that I manage telling me that they had automatically updated to WordPress 4.2.2.
This is a security update that happened in the background without me having to do anything.
This is a positive sign of the growing maturity of the WordPress ecosystem. Security updates are inevitable, making those updates seamless to users and administrators is very welcome. It also speeds up the rate of deployment massively thus reducing the exposure of a security problem.
I could, of course, choose to move away from self-hosting WordPress and to use the cloud delivered WordPress.com, but I quite like the fun.
Graham Chastney 
I am getting these messages too. so we will get these updates automatically in future or these automatic updates only for security updates.
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The automatic updates apply to certain types of updates which can be configured.
http://codex.wordpress.org/Configuring_Automatic_Background_Updates
or if you prefer a plug-in:
https://wordpress.org/plugins/stops-core-theme-and-plugin-updates/
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