sad news indeed. Thoughts and prayers go out to the family's and colleagues.
Flt test guys have to be respected for pushing these machines past there limits so that us regular guys can operate within a safe operating margin.
I wouldn't expect the 650 image to suffer in the long term. After a period of grieving, the sales and marketing machine will be in full swing.
They will communicate the risks of certification testing and just how far these a/c are pushed, therefore achieving a safe product backed by a history of excellence.
This doesn't in anyway take the shine off what is truly an awesome airplane.