If you're able to see the make and model of tire on Taycan test mules then that'll give you the answer to #1. Most pictures i've seen don't give you that opportunity.
Run flats are generally not great for performance. I'd suspect the tire sealant and compressor is what we'll get in the Taycan.No run flats on my Boxster or Cayenne.
Both come with tire sealant & compressor. Boxster has no spare since there is no place to put the flat tire.
Cayenne has an inflatable spare tire. Crap shoot on what the Taycan will come with.