Just to get some discussion going around here; these are a couple of brews I have pre-emptively worked up; if you guys want to offer suggestions or whatever go right ahead, or include cards I may have missed. PS these are not honed, have no testing and are just basic idea's I wanted to get out there to facilitate discussion.
Green White Enchantments
Evolutionary Leap 4
Herald of the Pantheon 4
From the Beyond 4
Mastery of the Unseen 4
Stasis Snare 4
Starfield of Nyx 2
Sigil of the Empty Throne 2
Retreat to Emeria 2
Retreat to Kazandu 2
Fellidar Sovereign 2
Planar Outburst 2
Blight Herder 4
Ulamog the Ceaseless Hunger 1
Only thing that worries me is a lack of early drops, Don't know if there are any other enchantment creatures I could use, or just any creatures period that facilitate the plan. Your attacking the opponent on a bunch of axis; hopefully gaining a ton of life, playing a bunch of enchantment's/ removal, and you should be able to flood the board with 1/1's and ramp into some of your bigger cards. Felidar Sovereign, Blight Herder, and Ulamog are all of your "big finishers" but you can also win the game with some of the other enchantments, or even sweep the board with planar outburst.
Atarka Aggro
Scythe Leopard 4
Undergrowth Champion 4
Managorger Hydra 4
Atarka's Command 4
Savage Knuckleblade 4
Exquisite Firecraft 4
Monastery Swiftspear 2
Stubborn Denial 3
Deathmist Raptor 4
Den Protector 3
36
Lumbering Falls 2
Wooded Foothills 4
Cinder Glade 4
Flooded Strand 4
Windswept Heath 4
Island 2
Forest 2
Mountain 2
24
This one is a low to the ground aggro build that tries to get aggressive early, and has the addition of having alot of tough hitters with some built in recursion. The den protector/Deathmist combo should help buy you things like Stubborn Denial, and give you some of that grindy game ability, while also gearing towards an aggro slant to end the game quickly. I'm not sure on the numbers, but any game where you curve Swiftspear, into double Scythe Leopard should be a pretty quick clock that needs to be answered. Undergrowth Champion and Managorger are there for the ability to get out of hand quickly and provide more resiliency. Finally you might be able to get some extra reach out of the Firecraft. This deck came out of the idea that Atarka's Command has a 4th mode that up until this point hasn't been used, but in a deck like this has alot of reach.
Imagine turn Three swinging with 2 Scythe Leopards, and an Ataraka's Command in hand, Play land for a turn (hopefully its a fetch) for +1/+1 on both, fetch to make them 3/3's, then atarka's command to add another land (4/4, 5/5 if its a fetch) and give them +1/+1 or deal 3 and have land enter; Theres alot of versatility to it.
Blue Green Eldrazi
Den Protector 4
Deathmist Raptor 4
Kiora Master of Depths 2
Shaman of Forgotten Ways 3
From the Beyond 3
GreenWarden of Murasa 2
Rattleclaw Mystic 3
Void Winnower 2
Conduit of Ruin 3
See the Unwritten 3
Ulamog the Ceaseless Hunger 2
Oblivion Sower 2
Titan's Presence 3
Lumbering Falls 2
Wooded Foothills 4
Cinder Glade 4
Shrine of the Forsaken Gods 2
Polluted Delta 4
Flooded Strand 4
Frontier Bivouac 4
Pretty simple ramp deck, Try to get out one of your ramp creatures, See the Unwritten into one of your big guys, hopefully a Conduit of Ruin, so that you can play more eldrazi from your hand. I have no idea how the rest of the ramp cards will line up in the set but even if some of your big guys get countered you have numerous ways to get them back. Probably not fast enough ramp, but if the set slows standard down enough maybe just maybe you could play something like this.
My favorite card from the set is From the Beyond, it's a 1/1 generator that ramps you AND allows you to tutor for one of your cards, potentially chaning From the Beyond, into Conduit of Ruin, into Ugin. Just seem's like a powerful card that is hard to remove unless your against dromoka's command decks.
I haven't even gotten to thinking about some of my favorite colors to build yet. Naya, G/W, and even Bant are decks that could all be really really good, just have to see what else gets spoiled.
Would love to see any lists that you guys have, or any feedback on the above with a few tweaks. Every day new spoilers come out I get another idea (for example the g/w enchantment deck came from From the Beyond being spoiled.)