So the Tri trailer goes with a flash back of a fight between Ogreand and Leomon (and I want to say that while it may be a flash back they are still gonna show Leomon dyeing because Lemon always dies, always!)
We then cut to a fight with Rosemon against Imperialdramon (now some people speculated that in the blurry trailer some people assumed that it is actually BlackImperialdramon I am here to now state that is wrong because this Imperialdramon has green eyes and not red eyes that BlackImperialdramon has).
And then for like the first time ever we have Vikemon in an Anime series I think.
Then we get a shot of the Digimon Emperor makes his return (yah Tri is bringing back the best part of 02, and this also means that the 02 kids are alive still).
After that not much else of note except for the Digimon girls in skimpy clothing (so fan service I guess)