I wouldn't be surprised if Tesla clears out the waiting list, discontinues the 220 miles version and releases a 240 miles version at a higher price. There is too much gap between the 220 and 310 miles range numbers. Maybe that's intentional because they know they will replace the 220 miles version with 240 miles.
This theory is more likely if it turns out they went over the 75 kWh maximum battery size Elon tweeted about. Especially if the numbers are 55/80 or 55/85, then I will make a prediction for the discontinuation date of the 220 miles version. However, if the numbers are 60/85 kWh then it's less clear.
Do you remember this article from Randy Carlson in Seeking Alpha, in 2015,
Will Tesla's Model 3 Compete? - Tesla Motors (NASDAQ:TSLA) | Seeking Alpha I kept it (printed it) and this weekend I took time to read it again, and his assumptions about standard and long range Model 3 were correct at 220 miles with a 44 kWh (RWD) and 310 miles with 66 kWh (RWD), and predicted a 320 milesAWD model 3 too, but with a a weight of only 3.251 lbs for standard Model 3, instead of actually 3.549 lbs.
This difference and the right predicted range make me think that there is a 50 kWh battery in the standard 3 and a 75 kWh in the LR 3 (we can see some 40% improvement in range between both, so the difference should be some what similar in battery packs (taking in account that there is always a little lost in efficiency because of the bigger weight)).
My two cents guess is that this huge gap between the two cars is intentional and will be filled once final ramp up is attained and they will be able to add options and configurations. If all goes ok, I think Tesla should be able to offer a 260 miles Model 3 at $39k in spring of 2019.
Latter, at the beginning of 2020 they could even discontinued the 220 miles version, then the 260 (60kWh) would became the standard 3 and LR would have some 330 miles with an improved 80 kWh battery (in 2020?). As I said, it's a wild guess, but at the same time, or even sooner, in late 2019, Tesla should release a new S with a 100 kWh standard battery from a new technology/ new chemistry with some 375 miles and a long range new S with some 400+ miles to compete with all long range EV cars from German Premium brands and new brands (Air Lucid) all meet to arrive in the market in the 2019-2020 time frame...