If you were worried about Sony running out of PlayStation 4's due to production issues before, you now don't need to worry.
Firstly, Sony are pushing hard to produce as many PlayStation 4's as needed, and that high demand should hopefully be met with enough consoles spare for the shelves on launch day. A leaked image has shown boxes upon boxes of PlayStation 4's leaving a manufacturing warehouse so the PS4 is definitely now in mass production.
Another good piece of news for those that haven't pre-ordered yet is that you still have a chance to pre-order and receive a console on launch day. Amazon are ensuring that any pre-orders for the PlayStation 4 console, even if they are just being pre-ordered now, will get the pre-orderer their console on launch day.
However, if you do want to pre-order from Amazon and haven't yet, you will need to pre-order a bundled version that costs $459. This is the same bundle as the standard launch edition except that it includes an extra controller.