SCE Worldwide Studios President Shuhei Yoshida always proves to be a gold mine of information about the PS4, especially when small but relevant details are concerned. Today he answered a few more questions about the console and its accessories as part of what he himself defines as his "unofficial customer service" on Twitter.First of all we learn that DualShock 4 controllers can be charged while the console is off. Apparently the USB ports stay powered even when the PS4 isn't running.

In addition to that he also confirms that the PS Move isn't the only old PS3 accessory that will be still compatible with the PS4, as the Navigation Controller will work as well.

Unfortunately you'll still need to make a new purchase if you want your old PS Move to work with the PS4, as the old PS Eye won't work, and you'll need to buy the new PlayStation Camera.

Finally, if you want to install many games on your PS4's hard disk (especially if you plan on installing them fully), you may want to consider upgrading your internal 500 GB hard disk, as games cannot be installed on external drives.

500 GB may sound like a lot, but anyone that has Steam can tell you that they run out very quickly if you start installing a lot of stuff without cleaning up periodically.  The three terabytes of games that are currently starting to be quite tight on my PC are a dreadful testimony to that... I really need to do some cleaning.