I doubt KOF XIV will get canceled, although there might slight chance for that. There has been few examples in recent years where game is close to completion and it got canceled for some reason.
I sure hope that there would be proper gameplay trailer when this Tokyo event happens. So far I've been satisfied with these character teasers, as I'm person who focuses on everything else than gameplay, but good quality gameplay would be good for marketing and would satisfy more gameplay oriented players. I have to agree, I'd like to see how the game plays properly.
I hope that people don't get urge to fight by drinking Burn to Fight....
[spoiler]Some off topic stuff, so I put it on spoilers.
I didn't have high hopes for Might No. 9, so I didn't support the game. Compared to Bloodstained: Ritual of the Night, these games are quite similar how they got started. Industry veteran leaves a company (s)he has worked for years, because of disappointment. He/She wants to do a game that is similar to past works (Mega Man, Castlevania), a spiritual successor.
Mighty No. 9 seemed like a too much a knock off of Mega Man and early gameplay didn't impress me. Bloodstained seemed like it wanted to Castlevania, but the style went to a different way. Or at least I'd like to think this way, because I put so much money into the game... [/spoiler]