Tesla need something juicy but I'm doubtful its going to be revolutionary. They'll spin it up like they always do, just like Musk has spun FSD year after year after year... and is spinning it again. I think we're into the realms of small incremental benefits not step changes in technology now. The Model 3 batteries are essentially the same as the MS and MX just in a different form factor and that tech is about 5 years old. There's been talk about improvements in sustainability more than capacity/performance from what I've seen.
I'd also be wary of any massive promises given they've pulled back on the battery warranty to be mileage limited and exclude software changes that reduce charge speed and/or capacity. Its one thing getting a show pony charge rate and capacity and its another providing warranty on it. But the MS and MX are due something soon.
I'm with you on all of this. V3 Supercharging speeds and a million mile battery, that sounds fantastic - ahh but the warranty now confirms it's ok to do what they've done in a clandestine way already. Nice.
My concern over the refresh is whether they decide to adopt the IMO ugly M3 landscape screen, as opposed to the nicely built in portrait one plus IC. By ordering now at least I've protected myself against that. If Battery Day reveals a lightly refreshed but similar form to now I'll consider cancelling and re-ordering - price and availability dependent of course. I'm also slightly nervous of anything new they bring in, historically many parts have proved to be unfit for purpose - e.g. MCU1, door handles, heaters etc and I'd like to think a new MS will be largely trouble free (as in fairness my existing car has been).
I've also no intention of running one out of warranty if I can help it!
And as for FSD aka the Unicorn, I've bitten the bullet as I use some of features I currently enjoy with EAP and those aren't included in the current Autopilot included offering.
Apologies to the OP I've gone rather OT here.