Stylus supposed on illustrator for ipad pro

Hi, does anyone know if there is any recommendation for certain stylus that will work on the ipad illustrator?

will it be the same as adobe Draw with any pressure sensitivity pen, or would some pens have other functions?

i know it is not released yet, but... just before I'm buying a stylus.. and for the future app.

as well, I would love to take part on testing it with the stylus I'm getting ...

is there still option for beta testing ? 

thanks