The Eagles debuted their all black uniforms at home against the New York Giants last year. The Eagles beat the Giants in that game by a final score of 27-0. The Eagles really need to beat the Giants on Monday Night Football next week, so this is probably as good a time as ever to break out the all-black jerseys once again.
Philadelphia's black uniforms tend to be polarizing. Some people like them, some people don't. Personally, I think they look pretty cool. The all-black look is definitely better than the black jersey and white pants look.
Note that the Eagles are allowed to wear their black alternates twice a season.