In layman's terms, is this another battery problem with the B787? Duh....
Only if it
was actually the battery, and the incident was directly related to its location, installation, use, integration with other systems, and maintenance.
If not, as someone has already pointed out, it is just sheer bad luck!
This was a serious incident but in fairness to Boeing, if it had occurred on any other model it would have drawn nowhere near the amount of comment and speculation that it has.