PS4 Firmware Update 4.50 Release Ruled Out

There was strong speculation that PlayStation 4 firmware update v4.50 would roll out today, but the lack of a PlayStation Blog post always seemed suspect. Now Sony has clarified on its Ask PlayStation Twitter account, stressing that there's no official date for the upgraded system software announced yet. We'd have expected it to be available by now if it was dropping today.

Patch notes leaked from PS China:

PlayStation 4 system software version 4.50 upgrade since March 7, 2017, will begin to provide system software 4.50 version of the upgrade.
Please upgrade the PS4 system software to the latest version at any time. By upgrading, you can add a variety of new features, improve operability or enhance security.

4.50 version main features :

You will be able to use the USB storage device to install the application or move the application from the PS4 host memory. The following conditions must be met for USB storage devices that can be used.