It's been mentioned that Sony might be using a competing brand of protective glass. Dragontail was it?
As far as being a replacement for the HX850, it's what they were telling all the media people at CES.
The reasoning being it is a step down from the HX950's fully array lighting, but is the only edge lit for 2013 that will have local dimming.
Also, the HX950 is not being discontinued for probably another 6 months.
FINALLY, the w900a is a KDL series NOT an XBR.
As far as the pricing, I think there has only been one source quoting that $3300 price. I believe there are some retailers showing it will come out $1000 less. It may have been a mistake.
Seriously, who would take edge lighting over full array with a $200 difference? Sony wouldn't sell many.
I know I'd go for the known quantity of the 950 rather than the untested tech of quantum dots.