We will definitely double the density in 10 years -hopefully more- (if fuel prices continue to raise, and EV vehicles sales rise up also)
The offering you mentioned is a "temptation"
as 15Kwh is already a very nice number for a bike...however is what I call a "risky package". Unlike what TESLA does (NTS mentioned TESLA as a reference, but did not mention that the TESLA battery pack has a very sophisticated water-cooled system...)this battery pack seems to have no cooling system.
Cylindrical cells have issues with uniform heat dissipation (during high rate discharge the core of the cells become hotter than the outside).The higher temperature makes the inner part of the battery to age faster, which results in the premature loss of capacity for the entire cell...They can argue that they are cheaper than pouch cells, but that's a different discussion...