As I had posted in the capital raise thread, it might be interesting for Tesla to set up a battery assembly plant in Asia, possibly near the existing Panasonic Osaka factories. Since the 100k production run rate expected at the end of 2015 is with Panasonic's Osaka plant cell output only, we are looking at roughly 7.5 GWh of output. That's more than Gigafactory 1 phase 1. By adding just the battery pack assembly plant to somewhere in Asia, the cells for packs bound for Asia or Europe don't need to travel to the U.S. as part of the production. That could lower costs dramatically.
I don't know the expected top level output rate of Panasonic's Osaka plants, but Tesla is expecting 15 GWh of cell production outside of the Gigafactory by 2020. I don't know how much of that is Panasonic alone, but with 50% of Tesla's 2014 sales outside of North America, it makes sense to have the roughly 3.5 GWh of non-NA battery pack demand in 2016 be made outside of NA and this seems to be a low cost way of doing it. China alone is 1/8 of Tesla's 2014 sales, so maybe a plant there.