Over here were some 'teasers' about 'battery pack' changes for the sedan including:
I kept wondering why the plan to change the name from 'ESS' to just 'Battery Pack'. Perhaps it will be totally different technology? For instance LiFePo cells with no liquid cooling? There have also been hints about quick change "pack swap" stations which were supposedly impractical with the old ESS. Anyways, there is a fair amount of anticipation now as to what 'Model S' will look like, but the changes for "Powertrain 2.0" are also supposed to be significant."...There's some pretty big changes on the powertrain side... going to make an announcement on that probably in a few months. There are really huge improvements on the powertrain side..."
"...changing the name of the ESS to the battery pack, that's what it is..."
"...yes, there's some significant improvements to the battery pack...
"...The Roadster's got really... Version 1 history of the technology; Version 2 is a whole step above that in many different ways..."
"...And so there are some really cool things that you'll see announced about WhiteStar..."
Lets hope the new 'battery pack' technology addresses the "pump always on" concern that Martin mentioned recently.