@botvinik I always liked the brown artifact frames from a logical perspective as well as aesthetic. Silver might go along with metal and machinery, but brown is indicative of old, rusty...like an artifact. The silver also looked too close to white when I first saw the shift as well. Brown was distinctly different from the other 5 colors and had the feel of an old, dirty, rusty artifact dug from the ground from a thousand years ago. Artifacts are rarely shiny and metallic when found.
I cannot wait to see how they screw up the foiling on these.
That being said, this set is just going to be nice because there are some key cards in that block that can use a reprint for the overall health of the game and other formats.
I wonder what frame they will use for lands though. Each of the older sets had a different frame for lands and I would really love me an old border Urborg, Tomb of Yawgmoth in the Legends frame.