From what I remember of the original unedited video he posted on his Patreon:
The can is ultra strong and tough, probably made of stainless steel. Quite the departure from past cylindrical cells. This is undoubtedly due to their structural battery pack design. They weren’t sure if they used the Dry Battery Electrode process to make the cathode and anode BUT they found that each layer was significantly thicker than past cells, so likely they are using DBE. The cells are quite complex in their internal guts, more so than past cylindrical cells. They appear custom designed to work in a specific pack architecture, which makes perfect sense, and that’s an obvious optimization for Tesla to do, and something they can now do since they make both the cells and the pack.
Chemical analysis, and energy estimations will come later.