Amazon.com Inc.’s big year of earnings improvement is expected to have culminated with some eye-popping growth during the holiday quarter. The e-commerce giant is forecast to post 80 cents a share in earnings for the December quarter, which would be up more than 2,500% from the 3 cents a share Amazon AMZN, -2.39% notched in the same period a year before. Quarterly operating income is projected to rise 280% to $10.4 billion.Meanwhile, full-year EPS growth is expected to log a big positive swing to$2.70, whe ...