Here's what I've been working on for the new Type 2.
// Lands
1 [CS] Snow-Covered Plains
4 [10E] Shivan Reef
4 [10E] Terramorphic Expanse
3 [CS] Boreal Shelf
6 [CS] Snow-Covered Island
7 [CS] Snow-Covered Mountain
// Creatures
4 [SHM] Swans of Bryn Argoll
4 [TSP] Riftwing Cloudskate
3 [10E] Siege-Gang Commander
2 [FUT] Venser, Shaper Savant
4 [CS] Phyrexian Ironfoot
// Spells
2 [10E] Tidings
4 [CS] Coldsteel Heart
4 [CS] Rune Snag
4 [CS] Skred
4 [10E] Incinerate
// Sideboard
SB: 2 [TSP] Draining Whelk
SB: 3 [TSB] Teferi's Moat
SB: 4 [9E] Bottle Gnomes
SB: 3 [SHM] Puncture Bolt
SB: 3 [TSP] Cancel
It's a deck loosely based around Swans of Bryn Argoll and Skred. It's fairly similar to Mannequin, Blink, or similar midrange blue decks. It doesn't play tempo quite as well as Blink but it has a lot of blowout turns where you Skred your Swan and draw 7, basically letting you scuplt your hand however you want.
I chose to splash White instead of Green because I'd rather have Teferi's Moat than Firespout. Yes, Firespout has great synergy with Swans, and I may end up playing it in the end, but right now I like Teferi's Moat more in the format. But like I said, it's up for debate.
I think this is superior to the Seismic Assault combo decks because Swans can win the game on their own, and playing the combo forces you to play cards that are not so hot on their own. Also, I think crap like Idyllic Tutor is terrible. If I'm going to spend mana, I'd rather interact with my opponent than just tutor. Furthermore, I think the combo is fairly tough to protect from disruption.
I played two matches last night, against Rg Tarmoburn and RG Big Mana and won them both. Against Big Mana you just let them Skred your Swans and draw as many cards as they want, as long as you counter their Cloudthreshers they have no way to stop him from killing them in 5 turns. It becomes a race which IMO is completely winnable. Against Rg Tarmoburn I just bounced his guys and played the tempo game until I could find a Swans. His build was pretty creature-heavy, which I think is pretty typical lately. So when I dropped Swans he mostly just drew some three-drops, and I was able to outtempo those fairly easily. Both matches were 2-1, which is pretty sweet considering those are probably two of the most-hyped/best decks in the new format.
I might cut a Boreal Shelf, the mana should be fine and sometimes it slows you down. Feel free to experiment. There's plenty of tuning to be done but I was pretty happy with the way this first build performed.