color is depending on the type of Wyandotte and the color/beard/earmuffs of the easter egger.
roosters should be around 7-8 lbs hens about a lb lighter. if the easter egger was bred for blue eggs, the eggs will probably be green. they should be good layers, good winter tolerance. they will slow down, but should lay in the winter. being a crossed chicken it typically will be healthier and grow a little faster.