It's not a bad omen at all, they are like 11-1 in those white pants and undefeated in the color rush uniform since they started wearing the white helmet. Hell, even the navy jersey and white pants uniform has an insanely high winning record when wearing it, I think they've only lost one game in that combo ever.
While I'd like to see this uniform with at least navy socks (the mono-color leotard look is so played out in NFL; good uniforms need contrast) and even the silver pants and normal helmet, it's still a beautiful uniform and I love it when they wear something different. I bet the Eagles break out the all-blacks for this game.