If there should be a remote chance that Tesla is able to sell a product in 2019/2020 based on new battery technology, they must already have preproduction cells

If there should be a remote chance that Tesla is able to sell a product in 2019/2020 based on new battery technology, they must already have preproduction cells in testing right now. 2 years is very close just to put something into production. So the prototypes shown must have at least the basics sorted out alread.