Jury's still out on the kangaroo cav (except for their bows, those bows are gorgeous) but I'm a big fan of the new mounted commander, especially as the original release lacked a generic leader HERO:
The creature looks cool and the character captures that classic High Elf vibe everyone wanted. Judging by the lore, it seems clear that the aelementari temples are going to have the weird stuff, while the Vanari, who fight for both the Teclis and Tyrion sides of the Lumineth as the rank-and-file, are closer to the old Helf aesthetic. Hopefully, as the range expands, this means that an all-Vanari army is viable.
If we look at the armor style on the greatsword-weilding Underworlds fighter, it's clear we're getting Vanari swordmasters someday too, for those folks who didn't like the yak-helmeted hammerers.
Alex