Huge. Ground-breaking. The first significant change (meaning that the manufacturers' logo swaps don't count) since Nike slashed away at Lombardi's sleeve stripes in 1997. For such a uniform-conscious, conservative team, this is big.
Hey, I'm serious. The Packers have been wearing white cleats since 1974. In the preseason, they wore the standard white cleat we're all used to seeing:
Then, when the regular season started, the Packers came out of the tunnel in black cleats, as seen this week against Dallas:
Now, there is some variation allowed. Every player must wear cleats which are predominantly of the team's official color. Rodgers wears cleats which have a much higher percentage of white than either Collins or Desmond Bishop above:
Nothing really new there, as Favre's white cleats usually incorporated a fair amount of green.
I'd love to know what the specific regs are, but the NFL is extremely reluctant to reveal this kind of information. If anybody has a copy, let me know.