That redesign has been known for a while, just never "confirmed". I see it as a way for Sony to keep charging 300$ for their console and not much more :p
That said, Sony's presentation at TGS disappointed me. It feels like no company wants to actually compete with Nintendo right now even though their new console is on the way. A simple mention of the PS4 with some preliminary concept for its design would have taken at least some wind out of Nintendo's sail, but it seems MS and Sony are content with letting Nintendo do what they want. I just see both of them as being very weak-willed, it's really weird.
... End of rant :p