As I understand it (info from factory rep and AOPA independently) the battery had gone dead, the airplane jumped from a start cart and then flown without CHARGING the batteries so when they retracted the gear it overloaded the charging system which in turn killed the ECU's causing a multi engine failure--a fix has been implemented and the aircraft are being flown again.
I recently was invited to an open house for Diamond A/C and I've got to say that I'm truly impressed with this company's adherence to the KISS principle of design---another reason I envy you young pilots---you'll be flying these beautiful aircraft, and other great new designs, far into the future