Well, let's get a calculator out and do the math.
Correct me if i'm wrong, but i believe the current 2070 capacity record holder is the lg m42..
LG M42 @ 58g..
3.64v nom x 4.2ah = 15.288
15.288 / 0.058 = 263.586 whrs/kg
..which is very close to what you see in 18650 chemistries.. 250-260whrs/kg.
We don't have a certain weight for the Tesla cell yet, but one group thought the cell is 4.8AH.. so let's be a little pessimistic and say 60g.
3.65v nom x 4.8ah = 17.52
17.52 / 0.060 = 292 whrs/kg.
Another poster seems to be very sure it's 5.75AH and 66 g, which would calculate to 322.3 whrs/kg
https://www.reddit.com/r/teslamotors/co ... alculated/
I'm kinda surprised some of these cells haven't slipped out the back door and found their way into the hands of a battery geek yet.