I managed to grab some of the configuration code for one of the new Inventory M3s with the bigger battery while they were listed (this is all buried in the web page so no magic to get it but it tells you a lot more about the car).
{
"code": "$RSF0",
"group": "HEATED_SEAT",
"long_name": "No Rear Heated Seats",
"name": "No Rear Heated Seats"
}
Key thing is it explicitly states No rear heated seats. Whereas if you look at the same info for the Long Range
{
"code": "$RSF1",
"name": "Front and Rear Heated Seats",
"long_name": "",
"description": "Rear Heated Seats"
}
Whats also interesting is the 0-60 time of 5.8s is listed but cars with the equivalent codes but measured in km do have 0-100 in 5.6 so I imagine somebody at Tesla has simply typed them in the wrong way round and why so many people are getting the 2 confused - Tesla themselves have them transposed and its not an interim model, the 5.6s to 60 is the 0-60 and its just recorded incorrectly in the cars meta data.
I wouldn't be selling the rear seat blanket just yet on the SR+ until someones taken delivery and actually confirmed it.