Looking into my crystal ball, here's my speculation.
If Tesla wasn't planning on doing any significant performance improvement, I think they would have brought out the performance variant at the same time as the other Highland models. The fact that it wasn't indicates that more time was required in the M3P's development, and perhaps to line up new parts supplies. It seems likely that one of those new parts will be sport seats with substantially improved bolstering. There has been a leak about these which I think will turn out to be accurate. It will fix one of the biggest negatives when driving a Model 3 hard.
I also expect a significant acceleration bump. When the M3P came out in 2018, there was nothing else in the class that could keep up with it through the 1/4 mile. That has changed, and I think that Tesla wants and needs to have the bragging rights of the M3P being the quickest in class. This means that it will have to be in the 2.x range to 60 and the 10.x range in the 1/4 mile. If I were Tesla, I would aim for at least 2.7 to 60 and 10.8 in the 1/4 under most conditions, with a few tenths better for both numbers on a prepped track and the car optimized. I think that Tesla has technical knowhow to do this fairly easily with little to no increase in weight.
I think that there is about 60% to 70% chance that Tesla will do some significant work to optimize the springs and shocks for improved ride and handling. There are aftermarket vendors out there like Mountain Pass Performance that have proved this is possible. I'm sure that Tesla could do even better; there will just be a price penalty for the more sophisticated shocks that will be necessary.
Increased tire and wheel sizes will probably be part of the package as well to achieve the acceleration and handling goals. Maybe 235s and 275s like mpgxsvcd suggested, or maybe some other size. Being more into the track performance than the 1/4 mile aspects, I'd prefer a square setup, say 265/35R19 all around. There's a lot of good performance tires available in that size, including Michelin Sport Cup2s and Goodyear Supercar 3s, which are fairly good on the track while still being very usable on the street.
Some improvements to the brakes would also be a very, very good idea. Between the increased acceleration and improved grip through the turns, the new M3P will really need them. I don't see carbon brakes because they're just too expensive, other than maybe as an option through the Tesla store. I think they will just try to fit a little bigger rotors, improved brake pads, and better brake fluid. I don't think this will be enough to really hold up to hard usage, but hopefully it would be an overall improvement over the current brakes.
If Tesla did all of the above, and I think they should, the new M3P would easily command a $10k premium over the AWD model, and I think it would be worth it. If Tesla charges $15k more, I'm not so sure it would be worth it, but they'd probably sell quite a few initially at that price, and they could always reduce the price later.
If Tesla wasn't planning on doing any significant performance improvement, I think they would have brought out the performance variant at the same time as the other Highland models. The fact that it wasn't indicates that more time was required in the M3P's development, and perhaps to line up new parts supplies. It seems likely that one of those new parts will be sport seats with substantially improved bolstering. There has been a leak about these which I think will turn out to be accurate. It will fix one of the biggest negatives when driving a Model 3 hard.
I also expect a significant acceleration bump. When the M3P came out in 2018, there was nothing else in the class that could keep up with it through the 1/4 mile. That has changed, and I think that Tesla wants and needs to have the bragging rights of the M3P being the quickest in class. This means that it will have to be in the 2.x range to 60 and the 10.x range in the 1/4 mile. If I were Tesla, I would aim for at least 2.7 to 60 and 10.8 in the 1/4 under most conditions, with a few tenths better for both numbers on a prepped track and the car optimized. I think that Tesla has technical knowhow to do this fairly easily with little to no increase in weight.
I think that there is about 60% to 70% chance that Tesla will do some significant work to optimize the springs and shocks for improved ride and handling. There are aftermarket vendors out there like Mountain Pass Performance that have proved this is possible. I'm sure that Tesla could do even better; there will just be a price penalty for the more sophisticated shocks that will be necessary.
Increased tire and wheel sizes will probably be part of the package as well to achieve the acceleration and handling goals. Maybe 235s and 275s like mpgxsvcd suggested, or maybe some other size. Being more into the track performance than the 1/4 mile aspects, I'd prefer a square setup, say 265/35R19 all around. There's a lot of good performance tires available in that size, including Michelin Sport Cup2s and Goodyear Supercar 3s, which are fairly good on the track while still being very usable on the street.
Some improvements to the brakes would also be a very, very good idea. Between the increased acceleration and improved grip through the turns, the new M3P will really need them. I don't see carbon brakes because they're just too expensive, other than maybe as an option through the Tesla store. I think they will just try to fit a little bigger rotors, improved brake pads, and better brake fluid. I don't think this will be enough to really hold up to hard usage, but hopefully it would be an overall improvement over the current brakes.
If Tesla did all of the above, and I think they should, the new M3P would easily command a $10k premium over the AWD model, and I think it would be worth it. If Tesla charges $15k more, I'm not so sure it would be worth it, but they'd probably sell quite a few initially at that price, and they could always reduce the price later.