The first update wasn't blogged, since I toggled the blog posting when I was doing some minor tweaking to versions. Here's all the cards I added then:

Tarkir is looking to be a relatively small update, but with a few really good cards.
Descendant of Storms is looking to be especially great. Mobilize and Endure seem fairly good for cube purposes.

Dalkovan Packbeasts will be great in supporting both aristocrats and go-wide themes.

Riling Dawnbreaker I think is the best of the common Omen cycle, with both modes being servicable to good. It almost has Serra Angel stats, and being a bear is a good failsafe.

Duty Beyond Death is an interesting trick. Permanently pumping the whole board is nothing to sneeze at.

Shock Brigade is a common Kari Zev, Skyship Raider. I think it will a welcome addition to red aggressive strategies, it wields equipments fairly well due to menace, and it helps out sacrificial strategies as well.

Sagu Wildling is probably fine, it isn't the most exciting card though. However, getting a basic for G is a good effect, it will (almost) never be a dead card.

Runescale Stormbrood is probably the best of the guild Omen cycle. I think it is funny that Izzet has another dragon in Sprite Dragon, and both go in the same type of deck.

Disruptive Stormbrood I'm not entirely sure on, but I think both modes are very... well, disruptive. Being a creature that is also removal is good for the various cards that return a permanent/creature from the graveyard.

The cuts are: Brightblade Stoat, Twinblade Geist, Githzerai Monk, Spotcycle Scouter, Horned Stoneseeker, Up the Beanstalk, Expressive Iteration and Binding the Old Gods.

A quick update to support the 'discard matters' cards a bit more. We've been getting some goodies lately in the form of Scrounging Skyray,Asylum Visitor, Ivora, Insatiable Heir and Marauding Mako. Adding these two cards back will add a bit of flexibility to the number of archetypes that can reliably discard cards.