Are you guys nervous?
Most people on this forum have no idea what yield is, what the numbers in the article means and if this in any way relates to them. Nevertheless there is a complete panic with several threads and a green brigade out in full force.
In short: Assuming the article is correct, 1) 50% yield of initial manufacturing for a big piece of silicon is ok but needs to go up over time. 2) It has no meaning for your product as you buy it what the yield was when manufactured and 3) Sony has not cut production at all (but might get fewer units to sell due to the supposed yield issue).
The timing of this is a bit funny though, there always seem to be hit pieces when Sony is about to come out with something good. THAT is interesting. Same story last time - and it was nothing then in the end.