I wouldn't take the Xros Wars manga as canon to the Adventure universe. Cyber Sleuth maybe, considering we have Yggdrasill showing up at all.
So, I just rewatched that opening scene, and noticed a few things I didn't the first time. First thing, amusingly, is that when Daigo's lying on the ground you can see a pair of goggles lying beside him. I also took a better look at the partners of the Holy Beasts. Hippogriffomon's partner's a chubby boy, Xuanwumon's is a girl with glasses, and Qinglongmon's is a nondescript boy. Wonder whether we'll see any more of them. The one girl looks suspiciously like Meiko... Anyway, I hope that all of the metaphysical jargon at the start of these movies will be explicable by the time Tri is over. That thing about the elements was interesting, if it wasn't nonsense. Water becomes darkness, fire becomes light, wind is between them, light sinks into the earth. That last bit sounds a little like Huanglongmon's profile.
Anyway, I forgot to mention that Mugendramon seems to have gained a new attack (that white energy tail thing). Probably it and Kuwagamon's new attack will remain forever nameless, unfortunately.
By the way, Muur, I've merged a few of your posts today. Remember to edit or copy/paste to avoid double posting.