As usual another preview build is released-this time Windows 10 Insider Preview Build 15031 for PC
Along with this preview build a few new features also been added.
compact overlay windows :When an app window enters compact overlay mode it’ll be shown above other windows so it won’t get blocked-so you can enjoy watching movie at the same time reading your email.
Dynamic lock: Windows 10 PC is automatically get locked when you’re not around based the proximity of a Bluetooth-paired phone.
To enable Dynamic Lock, make sure your phone is paired to your PC via Bluetooth and go to Settings > Accounts > Sign-in options and toggle Dynamic lock to “on”.
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To know more check it here