There is a lot of food for thought in that video.  They said Toyota is 5 yrs away from production.  I think they are 2-1/2 years away from production.  With having Fuel cell experience and hybrid experience they have a head start.

I think they may be testing the Electrovaya battery cell.  If Electrovaya's cell is far and above better than their own solid state cell then I can see them going with it in the US.  Maybe not in Japan.  But here is the important part.               They will not go with it unless they own it!  So a third company will be formed to own the solid state cell and Toyota will own a piece of that company.            Anyway it was very interesting and informative.  I will have to let it sink in a while.

Thanks