The Tesla Motors Website has been re-designed and a new 70D option is available (60 appears to be gone). There were discussions (speculation?) that Tesla was moving to a new battery cell that is slightly larger than the original cells, thereby reducing weight (due to less packaging) while keeping capacity the same. That would also provide the option to increase capacity, while keeping the weight the same (and everything in between). I wonder if they'll be upgrading the 85kWh packs too?