If I'm wrong, and there's no 2170 next week, the I really really wonder what IS going to happen next week. Certainly there will be two battery options. What would they be?
In Model S range and interior update imminent?, @wdolson made a good hypothesis about them bringing back an 85 kWh version:
If Tesla just makes a pack with the same modules as the current 100KWH with only 14 modules, it works out to around 85 KWH, so that is probably what Tesla will be doing if they don't drop the base pack entirely and make the 100 KWH the only option. It makes sense to get rid of the different module for the 75 pack, it's the same module as the 90 pack, only 14 of them to the pack.
That makes sense...but personally, I wish the 100 kWh battery would become the standard range battery and see them introduce something like 120 kWh for the long range battery.