I believe this will be a mapping update which calculates distance to charging stations and gives drivers notice when they are getting out of range. It would smartly know when you were getting too far from public and private charging stations and you’d be able to over-ride it if you were heading to your parents house for the night of charging, for instance.
Tesla has been tracking its Model S fleet so it knows what the average W/mile across all of the US roads so it can tell if you are really in trouble or not. As a Model S owner, I’m excited even though I rarely experience any range anxiety as it is.
Musk is also expected to announce a torque sleep and other updates which should improve the P85D’s 0-60 acceleration to around 3 seconds and improve range marginally at the same time.