I wasn't expecting an additional cycle of full-art lands and these two in particular are some of the most gorgeous printed this year:

 
Hell yeah.
I think most of the most interesting cards have already been covered, but here's a few I wanted to talk more about.
 Wan Shi Tong, All-Knowing
Wan Shi Tong, All-Knowing is surprisingly impressive. Only being a little silly here, but it's basically a blue 
Ravenous Chupacabra meets 
Cloudgoat Ranger. And it flies!
I think this has a great chance of making it into my Cube and sticking around so long as I have other cards that generate these spirit tokens by the time spoiler season is done. The biggest knock against it besides that is that I'm also very interesting in including 
Wan Shi Tong, Librarian and think they may legitimately get mixed up.
 Solstice Revelations
Solstice Revelations probably suffers from being limited to the number of mountains you've got on its first go-around, but I like this kind of mini-cascade thing. What puts it over the top for me is that it's an instant.
I give any card that's good sitting in a graveyard extra attention, and I love flashback cards that have a subtle way of being more powerful on their second go-around. Seriously interesting.
 Gran-Gran
Gran-Gran is also a little disappointing to me. I would've been close to including it without the second line of text at all, as getting a 1MV creature that loots on attack/waterbending is something I really like. 
Blurry Beeble was taken out for obvious reasons, but even without the unblockability, the gameplay it generates is pretty good. 
Benthic Biomancer is a staple of my on-deck binder, but also only gives you one shot to pay for the privilege. 
Enclave Cryptologist was in my cube for about a decade but my blue players hated spending mana on their main phases for her (and she's too expensive to level-up). Hell, I've recently considered 
Hapless Researcher! I may end up trying her out, but we'll see -- I took out 
Aunt May out of annoyance with her trinket text that occasionally would be relevant (a terrible sin) as well! Don't want to confuse drafters into seeing a lesson theme if I include just 1-2 of them.
 Firebending Student
Firebending Student feels like it's going to ruin standard, but is the right level for my Cube. I think 
Emberheart Challenger is the better pick in the same niche, but I do like firebending and think this is a great execution of it. The 
promo art of it being very foot-forward is...new for WotC. I think it's a positive that they're letting characters show midriff again in this set, but those are some toes!! We don't get toes on Magic cards very often.
Unlucky Cabbage Merchant is pretty ideal for my Cube, but it'd have a hard time beating out my other two-mana green dudes who come in with food tokens,  
Tough Cookie and 
Spider-Ham, Peter Porker. I love 
Avatar Kyoshi, Earthbender and would be playing her if she was 1 cheaper. 
The Last Agni Kai is great, but probably not for me. The design of 
The Fire Nation Drill is perfect.
This set feels much closer to a Final Fantasy than anything else. I'm beyond stoked to draft it!!!