Some look decent (Linken's, Planeswalker's) but most of those look very simple, I both hope and think that those are not the final icons yet.
I mean just look at MoM or Energy Booster. That's kind of pathetic.
It's kinda strange that the most magical items like Sheepstick, Dagon, Cyclon Scepter look the most plain. Even some basic items like Ogre Axe, Blade of Alacrity and Staff of Wizardry look more powerful.