Michael Schumacher is still in a medically induced coma, said his manager Sabine Kehm.
Batteries now have to be positioned in front of the engine and under the fuel tank.
Hamilton drives Mercedes into barrier but is unhurt; Formula One teams grapple with new rules.
Lewis Hamilton walked away from a heavy crash after putting in the first laps of Formula One's new turbo era.
The 53-year-old reflected the sombre mood within the Formula One community.
Dennis was group chief executive from 1982 to 2012 and team principal until 2009.
Bernie faces charges of bribery, incitement to breach of trust connected with a $45 million payment to a German banker.
Facing bribery charges, Ecclestone has insisted that he did "nothing illegal."
Daniel Ricciardo, who has joined Vettel at Red Bull, will race as number three.
Lotus announced this week that they would skip the Jerez test starting on Jan 28.