Unpowered Cube. Archetypes that favor interaction will always be preferred therefore there is very little if any support for infinite insta-win style combos (storm is not supported). I prefer the paper-rock-scissors style matchups that come from heavily supporting aggro, midrange, and control archetypes.
Planeswalkers are selected based on similar criteria such that an overpowered walker may possibly be benched in favor of a more interactive one in the spirit of an overall more enjoyable cube experience. Planeswalkers will be limited in number per color (3).
Stong dislike (but not completely banned) of: flip cards, double-faced cards, ,monarch, Dungeons, Initiative, Ring Tempting, transformed cards, marvel universe, Lotr etc type themes that are not mtg universe centric.
Functional reprints will generally be avoided with the goal of maximizing the replay ability of the cube. That's not to say functional reprints will always be avoided but it is a strong possibility.
Banned List (mainly because they just aren't fun): Mind Twist, Emrakuel
A few of the actively supported archetypes:
-mono red aggro
-mono white aggro
-RG beatdown haste / mid range aggro
-Stax
-Wildfire
-Blue based control variants splashing one or more other colors (generally white, red, or black)
-Show and Tell / Fattie Cheat styles (including reanimater, tinker, sneak attack eureka etc).
-Artifacts
-Blue/Red Spells matter
-Big green ramp
-BW good stuff/value
-Traditional Necropotence and lifegain white splash variants. That's right, necropotence.
-Splinter Twin combo is still available but being watched carefully