This is from an email from the Society of Experimental Test Pilots.
Reports indicate that onboard the Sabreliner were the two BAE pilots, their crew chief, and a contractor. The Cessna was flown by a solo pilot. None of the deceased were SETP Members.
It is implied elsewhere that this was a Mojave based aircraft.
I have deep sympathies for all involved, but can understand that particularly if this was on a flight trial, that an initial statement of circumstances may take a little while to generate.
Certainly Tfor2's demand for a statement within 3 days is totally unrealistic. NTSB's job is to create a thorough report with safety recommendations - not to satisfy somebody on the Internet within a week.