> they might…

Indeed http://www.google.com/nexus/5/ and http://www.google.com/nexus/9/

Too bad the Nexus 5 can't be upgraded to replace the battery with the rapid-charge battery technology they are touting for the Nexus 6.

>>Get up to 6 hours of use from only 15 minutes of charging.

There's no real special technology there, if you do the math on their claim it works out to a maximum power draw from the charger of 12-15W, which is about on par with most tablets. This is just a function of having a large surface area to dissipate waste heat.