A huge chunk of the cube has rotated. The major goals of this update were to hone in on each color pairs strengths. With the help of the double feature black and white treatments we have access to a lot of role players. They're not necessarily the most powerful cards, but they fit better within the plan.
The most major changes are the removal of most the mutate and ninja cards. The Ikoria showcase cards are, for me, some of the best looking cards magic has done, but mutate is a hard mechanic to fit in a cube. We also wished happy trails to the draft fodder Ninja's. Baleful strix retro frame is not ideally what we would like from our alt arts. We would like more than just a frame swap. The inclusion of the retro frame artifacts is less of an issue since they include actual alternate schematic art. Those schematic artifacts are also the third major overhaul for the cube. The mana rocks and a few of the worst artifacts have been overhauled for more relevant choices. I went back and forth on cutting the mana rocks, but with almost no artifact synergy on the cube and most decks not really wanting to take a turn off to play a mana rock anyways it was decided they were a safe cut.
What we're thinking with the weirder inclusions:
Vorthos: gives the RW legends deck some flexibility in going to 5 color legends
Vivisection: the idea is that it's a narrow card draw spell aimed at a late pick for UW or UG, which can't prioritize card draw spells as early.
Trovolar: Trying out wolves and werewolves to give RG a more flavorful identity while retaining the basic strategy of mid range beatdown.
Tapping at the window: a little more boon to the BG deck. I remember this playing better than it looked, but it might not be powerful enough for the cube.
Grey Knight Paragon: placeholder until we finally can get the cards in or swords to plowshares and path to exile.
Next update is not expected until after Ixalan.