So, my friends and I from home just competed in our little release tournament (2 weeks after the actual release...).

~Sealed Pool~
White:
Glory Seeker
Harmless Assault
Ikiral Outrider
Kabria Vindicator x2
Knight of Cliffhaven
Kor Line-Slinger x2
Luminous Wake x2
Near-Death Experience
Nomad's Assembly
Puncturing Light
Stalwart Shield-Bearers x2
Wall of Omens

Green:
Awakening Zone
Bear Umbra
Gravity Well
Haze Frog x2
Living Destiny
Mul-Daya Channelers
Nest Invader
Stomper Cub

Red:
Emrakul's Hatcher x2
Flame Slash
Forked Bolt
Goblin Arsonist x2
Goblin Tunneler
Grotag Seige-Runner
Heat Ray
Lavafume Invoker
Ogre Sentry x2
Wrap in Flames x3

Black:
Arrogant Bloodlord
Bala Ged Scorpion
Bloodrite Invoker x2
Contaminated Ground x2
Dread Drone
Gloomhunter
Inquisition of Kozilek
Nighthaze
Null Champion
Pawn of Ulamog x2
Shrivel
Skeletal Wurm
Virulent Swipe

Blue:
Aura Finesse x2
Coralhelm Commander
Deprive
Distortion Strike
Eel Umbra x2
Fleeting Distraction x3
Guard Gomazoa x2
Jwari Scuttler x2
Merfolk Observer
Regress
See Beyond
Skywatcher Adept
Venerated Teacher x2
Shared Discovery

Colorless/Land:
Evolving Wilds x3
Pathrazer of Ulamog
Pennon Blade
Reinforced Bulwark
Warmonger's Chariot

~First impression~
Dismal. Despite a few good cards, green was out of the running early. It wasn't worth the splashy mana needed, by my opinion. Despite the decent and rather large quantity of white cards, they didn't impress me at all. White seemed to slow for me, though I probably could have built a solid level-based deck with it. In retrospect, I probably should have played red. My pretty decent burn spell pull coupled with the two Hatchers and the Seige-Runner (which would have saved me a lot of pain down the line) would have been immensely helpful. Instead, I played one of my least favorite color combos...blue and black. Why? Black had a lot of decent creatures, both early and late game. That Skeletal Wurm was a complete bomb for me, plus a splash of removal and a lot of token generation helped. Blue was the second choice, with a lot of card draw, the umbras and two Guard Gomazoa for defense, and I could not ignore the pull of an early game 4/4 flyer in the form of the Coralhelm Commander. Also, I think Distortion Strike is one of my favorite cards out of the set.

~What I built~
Creatures:
Arrogant Bloodlord
Bala Ged Scorpion
Bloodrite Invoker
Coralhelm Commander
Dread Drone
Gloomhunter
Guard Gomazoa x2
Jwari Scuttler
Merfolk Observer
Null Champion
Pathrazer of Ulamog
Pawn of Ulamog x2
Skeletal Wurm

Non-Creature Spells:
Distortion Strike
Fleeting Distraction x2
Eel Umbra x2
Pennon Blade
Regress
See Beyond
Shrivel
Virulent Swipe

Land:
3x Evolving Wilds
7x Islands
7x Swamp

~So...how'd that work out?~
Ended up playing 3 games.

Game 1: vs. Green/Blue/White Control
Started off rocky, having my early Champion Nacrolepsied right off the bat, making it useless. An early Gomazoa pulled it's weight and then some (they're ridiculous if you're not playing against red with enough burn)...but his did as well. Exchanged a few blows, and I got to take out a good chunk of his life, most of which was recovered by Luminous Wake. My Wurm held his Pelaka Wurm at bay, and I swung with a hardcast Pathrazer, but that only lasted one turn, when he turned it into a ginormous wall with Guard Duty. From there, he stalled out my 42-card deck with his 60, and won by decking me.

Game 2: White/Red Defender
Started ahead by Fleeting Distraction to draw into an early Observer, followed by a Scuttler, which got a Pennon Blade. His only defense was an Ikrial leveled once, which I bounced with Regress and destroyed the next turn with Bala Ged Scorpion when he re-played it. At that point, his walls could not keep up with my 5/6 crab, especially with Distortion Strike and Virulent Swipe tagged on for two turns (making it a 8/6 unblockable).

Game 3: (Same as game 2)
Once again, had a relatively early start with a Gloomhunter and a fully-leveled Coralhelm, which was eventually taken out by a Guard Duty, both of my Pawns, and an Arrogant Bloodlord. In this time, he managed to pump out a Molten Sentry, an Ogre Sentry, a Soulbound Guardians, and two Reinfoced Bullwak, smacking me in the face for a total of 13 over the turns using the Sentry's ability. I had him at one life, but there was no possible way for any of my creatures to attack through. From there, I cast a Bloodrite Invoker and Eel Umbra on it, and waited for mana, crashing my creatures into walls in order to generate Eldrazi tokens. That eventually paid off, allowing me to use the Invoker's ability to deal the 1 damage I needed to win.

*** I'm no pro at sealed builds, so any hints and tips you could give me in regards to this would be immensely helpful.