i don’t want make a crazy in depth post for that i also lack knowledge about Aztec myth but i really like the aesthetics it looks cool and refreshing.
now to some of the units and some quick thoughts:
since its a symbole of death i could see it flying over units and leave a path of smoke decay as its special similar to Rodan did in the Godzila movie leaving a path of lava-dust behind. or the unit it kills turns into an undead? - as a noobie i was surprised owls are not only part of aztec mythology but also something dark/“bad” unlike in other cultures. the landing tho makes me curious if it behaves similar to the roc but i cannot see such an important creature and symbole of death being a transport unit.
this snake i remember as part of the aztec mod for EE. there it just was much bigger if i remember correctly. i am totally fine its smaller now and i assume this ne might be classical age myth unit behaving like Prometheans so when you kill the snake it splits into two smaller snakes - with one head then of course. i cannot see this unit as impactful as the owl (or the giant armadillo) so thats why i did put it in classical age. but maybe its “just” a campaign unit.
i was really confused when i saw these fellas the first time. but after a quick research they seem to be “moon rabbits” i assume this unit will be very certainly be either a godpower or campaign unit and nothing more.
speaking of godpower/campaign unit i REALLY thinki this scorpian unit will be one too. here i am more certain it will be a godpower tho. (that some guys were scared that this might be a temple myth unit was surprising to me since it doesn’t look either big or special enough.)
i really like this unit and the idea behind it. that its THAT big is surprising tho and makes me wonder why its not a construct then cause it would have made a badass construct in my opinion. many already think it will behave similar to TaoWu and i personally kinda agree with it. (the pattern looks fancy but maybe a bit too “bright”/“busy”)
this unit i also remember fromt he EE aztec mod. back there this was one of my most favourite myth units it looked creepy-cool and had a cool and scary special. i wonder if it will still have the same special/similar one. (it jumped on a unit and devoured it) wonder if it will crawl or walk. cool myth unit simple as that.
i also remember this unit from the mod. but now the main body doesn’t look like a “wold” but more like a mix between a taira and a opossum. (?) i immediately had opossum in mind and after a quick search this actually seems to be the case. i assime it will be amphibian like in the mod. wonder if it grabs a unit with its special. (i would suggest to throw it but we already had so many throws in the japanese dlc 
but maye one other wouldn’t hurt?)
this one seems to be connected to Tlaloc. the version Tlaloc had in the EE mod was much cooler in my opinion but this looks so derpy it could be really fun to use like some voodoo gnome or redcap? would be fun to see them zap around as lightining otherwise i would really like to know other ideas for this little fella.
axolotl looks like it will also be amphibian. i think it will either heal or shield units. classical age or doc unit?
i personally LOVE the aesthetic of this unit! i really wanted and hoped for a unit like this and to see it make me REALLY happy! i hope this won’t be just a campaign unit. (please!) its too damn cool for that. i am not sure if it might be a military unit tho but i think it will be similar to valkyrie in terms of stats and mobility but i doubt it will heal and mabye have another special like maybe throwing a special spear or dart? or jumping on a unit similar to white tiger from chinese pantheon? so excited for this one especially.
this military unit seems to have the role of either the base warrior like hoplite or the bit more specialist role like katapeltes? like the design!
but maybe this one is the “base warrior unit” could behave like dao swordsman or maybe huscarl or murmillo? i personally assume it will behave similar to murmillo which makes the other one more like katapeltes. also really like this design.
this one made me excited. its either a throwing axemen so a range anti infantry unit or similar to fanatics? i personally think it will be like throwing axemen which would fit and would be really cool!
this unit looks like the elite military unit. like the chinese or special greek units. i assume it will be a generalist but feel free to correct me. either that or it will be like huscarl very quick anti range military unit.
this, i assume, will be either the base hero or/and priest options. similar to egypt with their pharaoh and priest?