I have seen a few cards in M15 and Huey to make me think that Walls may be a bit more interactive/useful, and that Wizards might like to see them being played. We also know that an evergreen mechanic is being changed, and why not defender?
How would this be a change? There are defenders in every set, there were defenders matters subthemes in several sets. If you're saying every set in the future will be Rise of the Eldrazi then I don't think that's what they mean by evergreen changes, and if you're not what would be the difference?
BAfter the lights go out on you, after your worthless life is through. I will remember how you scream...B