I don't really like the idea of making Ents champions. In KB, they move one square, and they were made five-tiered only because they were given a lot of hit points. But a champion should be fast and strong, and being fat isn't necessary :).
Pegasi are also a good unit. But they probably won't survive against unicorns. Maybe make an upgrade (Elven Wizards use their druidic magic to grow wings on a unicorn :D). And I think bears should be in the core units. Maybe the developers will actually add some kind of beasts?
Added 1 minute ago
[/U]Regular phoenixes aren't red, but the color of the sun, fire - yellow-orange. And I haven't played 1-2, so why do you call me a newbie? :)
I would like them to bring back pegasi or add hippogriffs. Bears will probably be given to the Dwarves, as in 5, although anything is possible. I wouldn't refuse a beast (as long as it's made properly, and they don't add praying mantises or hives)
Демократия есть одурачивание народа при помощи народа ради блага народа.(Уайльд Оскар)