This video shows the runway this morning. JA13XL appears to have ended up off to the right of the runway, partly taking out the PAPI system for 16L. Part of the tail and some of the aft section remains, so hopefully the Black Boxes weren't too badly damaged. The right-hand side of the aircraft was slightly more damaged than the left-hand side. The Dash 8 on the other hand is just a charred mess. However, it's evident that the Dash 8 was indeed lined up with the runway, as if it was waiting for a departure clearance. It'll be interesting to hear the Dash 8 Captain's version.
This shows also shows the damage in daylight, along with some other angles both inside and outside of the A350.