Wasn't there also a leak that stated even though it was pure fire, it's HA would be a new ability that basically gave it STAB on all punch moves, and that is would be able to learn all punch moves, including ice punch. Not sure of the validity, but that would certainly be interesting.
There's really no way to know that. All have have is the stream schedule I'll post below. If I had to guess, the big reveals will be on Sunday before the finals but maybe someone who remembers from the last year years can confirm. I'm sure even sure the info reveals would be streamed, you may just have to keep an eye out on social media/this site.