"Executive producer Lane Lueras screened the trailer for Season 2 of 'Kung Fu Panda: The Paws of Destiny,' which bows July 5 on Prime Video." (Source)
Thanks to User:USSAA for the find!
I'm pretty sure the statement is referring to Season 2 itself, not just the trailer (because apparently it hasn't been publicly released yet), though it's possible that that's precisely the case. Hence the question mark after "July 5" in the title.
No other news yet on what Season 2 features. I'll post updates in this thread as I find those.
UPDATE (June 18, 2019): Trailer released today, season two is indeed releasing on July 5.