I generally like the expanded options of Channel Nature (not in love with the name, though—something like "Nature's Blessing" would sound better) including Wild Companion (from Tasha's) and Healing Blossoms (though I think that how it's currently implemented is underwhelming). Despite these new options, most of the features of the base class revolve around Wildshape, to my dismay, instead of adding more interesting non-Wildshape features. And speaking of the Wildshape ability, they make it worse: gone are the ablative hp, you don't gain an aquatic form until 7th level (as opposed to 4th level in the 2014 PHB), you don't gain an aerial form until 9th level (as opposed to 8th level), and, quixotically, you can't turn into a Tiny creature until 11th level! Even though I'd like to see Wildshape de-emphasized in the base class, it didn't need to be nerfed!
I do understand that the templates will make things easier, and I'm mostly okay with them. However, the execution is lackluster—like others have suggested, I'd be more onboard with these templates if you could modify the base form with secondary traits such as pounce, pack tactics, spider climb, etc. to better model different animal types.
As to the Circle of the Moon... What the hell, WotC?! This subclass was about being able to use more powerful Wildshape forms than the base class and being able to tank effectively. Now all you get is the standard Wildshape form with a bonus action Unarmed Strike. Again, the loss of ablative hp hurt the tanking ability of this subclass and, if that wasn't enough, the 6th-level Primal Strike ability is gone—nerf upon nerf. Elemental Wildshape has been changed, too—while it now comes online at 6th level (instead of 10th level), you no longer turn into an elemental, but instead gain elemental resistance/damage to attacks. Not exactly awful, but a change that's unnecessary. Overall, this revised subclass is a major downgrade and something I wouldn't want to play.