My guesses are:
1. Map of a USA fast-charging network along the Interstate Highway System with rollout plans -- "range anxiety solved!" :biggrin: Hopefully, in partnership with other auto manufacturers to share installation cost. Or, perhaps Tesla partners with Starbucks (or similar) in key locations near said interstates to provide the parking spaces? (Just brain-storming here).
2. They figured out a way to DC charge even faster.
3. They figured out a way to charge the 40 KWh battery without degradation.
4. They will have an adapter for the new standard fast charging interface all the majors agreed on recently (leaving out the Leaf and Tesla's proprietary ones).
My hope is all 4 are true, but we'll have to wait and see. Maybe it will be a classic Jobsian-style: "Oh... One more thing..." from Elon?
Sure is a very exciting time for us Model S evangelists, reservationists, stockholders, etc. between now and August 1st! :biggrin: It's "Tesla Fever Time"!!