Tesla will royally screw you on trade-in values.
I would wait for the old lease to end, if that's your one and only car.
Or see if you can ditch at at:
Worlds Largest Lease Marketplace | Swapalease.com
If you have multiple cars, see if you can reshuffle your garage and make room for a TM3 towards end of December. Elon will be desperate to meet guidance for 460K cars sold in 2019, and they will be dealing like crazy!
a