Following up on my earlier post (#77 in this thread) re a report quoting the Legacy captain saying he'd turned the transponder off and climbed without advising ATC, a subsequent news report covering the crew's deposition to police at Cuiabá, has the crew stating they were in stable cruise at FL 370, the level to which they had been cleared by ATC. The same article mentions the crew's stating their TCAS gave no warning.
Another news article quotes a farm labourer who saw the 738 coming down saying it was "tumbling" or "spinning" (in Portuguese, "rodopiando").
Other articles indicate the wreckage was concentrated in a 1km2 area or "spread over 10km2".
Re geometry and, for what it's worth, someone has posted a theoretical simulation of winglet contacts on youtube:
http://www.youtube.com/watch?v=wRKtG3qoUcU&eurl=
Someone in an earlier post mentioned trees in the forest where the 738 crashed being over 20' tall. More like 40m tall, ie the forest canopy at a height equivalent to a 13 storey building. Reports from the first airforce rescue team helilifted in indicate there was fire. But that height of forest canopy would have muffled any explosion.
Just a note re ANAC, Brazil's new civil aviation agency. Very recently created, mostly political nominees and probably somewhat over their heads in this, likely to be playing catch-up with the military people directly involved in the investigation. Don't expect much real information to be forthcoming from that quarter. On the other hand I would certainly expect a rapid stream of hard information coming through directly or otherwise from other sources including airforce over the next few days.